bound 三个高频独立义项，全部是形容词/表语结构：① be bound to do（必然，一定会：he is bound to fail = 他注定会失败）；② be bound by sth.（受某物约束：bound by rules = 受规则约束）；③ be bound for（前往，目的地是：a ship bound for Shanghai = 前往上海的船）。另外：bound = bind（绑定）的过去式/过去分词，也可作动词（the police bound his hands = 警察绑住了他的手）；名词 bounds（范围，界限：out of bounds = 禁止进入；within bounds = 在范围之内）。
释义
1
adj.（be bound to do）必然，一定会（强烈预测）
With so many people attending the event, there is bound to be a shortage of seating, so it's advisable to arrive early.
有那么多人参加活动，必然会出现座位不足的情况，所以建议早点到达。
2
adj.（be bound by）受…约束，有义务（by a rule/contract）
All employees are bound by the confidentiality agreement signed upon joining the company.
所有员工都受入职时签署的保密协议约束。
3
adj.（be bound for）前往…，目的地是（交通）
The cruise ship was bound for the Caribbean when it was forced to turn back due to a mechanical failure.
这艘游轮正开往加勒比海，却因机械故障被迫返回。
语感
be bound to（一定会）；be bound by（受约束）；be bound for（前往）；out of bounds（禁区）
三种结构辨析（全是固定搭配）：be bound to do（一定会，必然：there's bound to be = 一定会有；it was bound to happen = 这是注定的）；be bound by sth.（受…约束，有义务：bound by a contract/law = 受合同/法律约束）；be bound for sth.（前往，目的地：a train bound for Beijing = 开往北京的火车）。高频短语：out of bounds（禁止进入/超出范围：this topic is out of bounds = 这个话题不该触碰；ball out of bounds = 界外球）；within bounds（在合理范围内）；bound up with（与…密切相关：her success is bound up with the team's efforts = 她的成功与团队努力密不可分）；bounds（复数名词，界限：know no bounds = 无边无际：his enthusiasm knows no bounds）。
陷阱
⚠️be bound to（一定会）vs. be obliged to（有义务）
✗
As a professional accountant, he is bound to follow a strict code of conduct and cannot assist clients with tax evasion.
作为一名专业会计师，他有义务遵守严格的行为准则，不能协助客户逃税。（bound by = 受约束；bound to = 一定会，两者在此语境有细微差别）
此处是「职业义务」：专业会计师「有义务」遵守，应是 be bound by（受约束）或 be obliged/required to（有义务做）；be bound to do 含「必然会发生」义，而非「有义务」；× bound to follow（注定会遵守，语义不准确）→ ✓ bound by a code of conduct / obliged to follow；不过 bound to 在口语中也常用于「有义务」（I'm bound to tell you = 我有义务告诉你），语境决定
✓
As a professional accountant, he is bound by a strict code of conduct and cannot assist clients with tax evasion.
作为一名专业会计师，他受严格行为准则约束，不能协助客户逃税。
⚠️there's bound to be（一定会有）固定结构
Given the scale of the reform programme, there are bound to be some unintended consequences that policymakers have not anticipated.
✗
× there are surely to be（bound to = surely to，两者一样）
✓
there is/are bound to be（一定会有）是固定表达；× there are surely to be 不是固定结构（surely 是副词，不用 surely to be）；bound to be = 一定会是；注意主谓一致：there is bound to be（单数）/ there are bound to be（复数）
鉴于改革计划的规模，一定会有一些政策制定者未预料到的意外后果。（there are bound to be = 固定结构）
近义辨析
boundvscertain
boundbound to（必然会：he is bound to succeed = 他必然会成功，强烈预测）certaincertain to（必然的，类似 bound to：he is certain to succeed = 他必然会成功；比 bound to 更正式，也用于 it is certain that = 可以确定的是）
With such a dedicated team and clear strategy, the project is bound to deliver results above expectations.
有这样一支专注的团队和明确的策略，这个项目必然会取得超出预期的成果。
If the current trend continues, renewable energy is certain to account for the majority of global electricity production within two decades.
如果当前趋势持续下去，可再生能源必将在二十年内占全球电力生产的大多数。
写作加分
✨ 加分词
替换：will definitelymusthave to
政策分析话题社会预测话题问题与解决方案话题
普通
If nothing changes, there will definitely be problems.
如果什么都不改变，肯定会出问题。
加分 ✨
Without systemic reform of the housing sector, there is bound to be a deepening crisis as demand continues to outpace supply.
若不对住房行业进行系统性改革，随着需求持续超过供应，必然会出现日益加深的危机。
为什么更好：there is bound to be 比 there will definitely be 更书面自然；without systemic reform 引入条件；demand continues to outpace supply 具体化机制
常用搭配
be bound to do必然会（强烈预测）
be bound by sth.受…约束（合同/法律/规则）
be bound for前往（目的地）
out of bounds禁止进入；超出范围（体育界外球）
bound up with与…密切相关
know no bounds无边无际（know no bounds = 无限）
词根
bound = bind（绑）的过去式 → 被「绑」住 = 受约束；bound to = 被「绑」着要做 = 必然会；bound for = 被「绑定」前往某地 = 开往；out of bounds = 超出「绑定范围」= 界外/禁区
考考你
Q1义项辨析
下面四个句子中，bound 的含义与其他三个最不同的是：
A
The train bound for Edinburgh leaves from platform seven at half past two.
开往爱丁堡的火车在两点半从七站台出发。
B
If you keep putting off revision, you are bound to struggle in the examination.
如果你一直拖延复习，考试肯定会很困难。
C
There is bound to be some resistance to the new policy from members of the existing committee.
现有委员会的一些成员必然会对新政策有所抵制。
D
The new measures are bound to reduce costs, though their full impact may take years to materialise.
新措施必然会降低成本，尽管其全面影响可能需要数年才能显现。
A 中 bound for = 前往（目的地）；B、C、D 中 bound to = 必然会（强烈预测）
Q2对错判断
判断下面句子里的用法是否正确：
Medical staff are bound by strict confidentiality rules and are not permitted to share patient information with third parties.
医务人员受严格保密规定约束，不得与第三方分享患者信息。
be bound by（受…约束）用法正确，介词 by 后接「约束来源」（rules/contract/law）；are not permitted to（不被允许）与 bound by 逻辑一致
Q3搭配还原
选择正确的介词，完成句子：
Her career as a diplomat is closely ___ ___ her family's long tradition of public service.
她作为外交官的职业生涯与她家庭长期从事公共服务的传统密切相关。
Abound up with
Bbound for
Cbound by
Dbound to
完整搭配：bound up with 与…密切相关（固定搭配）
bound up with（与…密切相关）是固定短语；closely bound up with = 与…密切相连；× bound for（前往）、× bound by（受约束）、× bound to（必然）含义均不符
接着学
点击进入该词的深度解析
obliged近义有义务的（be obliged to do = 有义务做；比 bound by 更强调「道德/礼貌义务」）
inevitable近义不可避免的（inevitable consequence = 不可避免的后果；比 bound to 更正式，强调客观必然性）
constrained近义受限制的（constrained by = 受…限制；比 bound by 更强调「外力限制」）
destination近义目的地（the final destination = 最终目的地；bound for 的目的地名词）