critical 有三个核心义：① 「批评的，挑剔的」：be critical of（批评：be critical of the decision = 批评该决定）；critical comments（批评性评论）；② 「关键的，至关重要的」：a critical factor / role / point（关键因素/作用/时刻）；critical thinking（批判性思维）；③ 「危急的（医疗/情况）」：in a critical condition（病情危急）；a critical moment / juncture（关键/危急时刻）。辨析：critical（「关键的」与「批评的」双义，注意语境）vs. crucial（至关重要的，仅有「关键」义，无「批评」义：crucial evidence = 关键证据）vs. vital（生死攸关的，最强烈：vital to survival = 对生存至关重要）。
释义
1
adj.批评的，挑剔的（be critical of）
Several leading economists have been highly critical of the government's decision to cut public investment at a time of economic uncertainty.
几位顶级经济学家对政府在经济不确定时期削减公共投资的决定持高度批评态度。
2
adj.关键的，至关重要的
Access to clean water is critical to the health and wellbeing of communities in regions affected by prolonged drought.
获得清洁水对受长期干旱影响地区社区的健康和福祉至关重要。
3
adj.危急的（医疗状况或紧急情况）
Three patients remain in a critical condition following the accident, with medical staff working around the clock to stabilise them.
事故后三名患者仍处于危急状况，医务人员夜以继日地工作以使其病情稳定。
语感
be critical of（批评，挑剔）；a critical factor / role（关键因素/作用）；critical thinking（批判性思维）；in a critical condition（病情危急）；at a critical moment / juncture（在关键时刻）
批评的，挑剔的（be critical of = 批评…）关键的，至关重要的（critical factor）危急的（in a critical condition）
高频搭配：be critical of sb./sth.（批评：be critical of the policy = 批评该政策）；critically important（极其重要的：critically important for = 对…极其重要）；a critical role / factor（关键作用/因素）；critical thinking（批判性思维：develop critical thinking skills = 培养批判性思维能力）；in a critical condition（病情危急：the patient is in a critical condition = 患者病情危急）；at a critical juncture / moment / stage（在关键节点/时刻/阶段）；critical acclaim（获得评论界好评：received critical acclaim = 获得好评）；辨析：critical（关键的，也有「批评」义）vs. crucial（至关重要的，无「批评」义，更强调决定性：crucial evidence = 决定性证据）vs. vital（生死攸关的：vital organs = 重要器官；vital for survival）vs. essential（必不可少的：essential services = 基本服务）。
陷阱
⚠️be critical of（批评）——× be critical about
Opposition politicians were openly critical of the proposed legislation, arguing that it would undermine civil liberties.
✗
× be critical about（介词错误）
✓
be critical of（批评，固定介词 of：be critical of the decision = 批评该决定）；× be critical about（非标准；compare：be concerned about = 对…担忧，用 about；但 critical = 批评，固定用 of）；critical about 在「仔细审视」语境偶见，但「批评某人/某事」标准为 critical of
The prosecutor presented what was described as the most critical piece of evidence in the case — a DNA match linking the suspect directly to the crime scene.
The prosecutor presented what was described as the most crucial piece of evidence in the case — a DNA match linking the suspect directly to the crime scene.
Media literacy is a critical skill in the digital age, enabling citizens to distinguish reliable information from misinformation.
媒体素养是数字时代的关键技能，使公民能够区分可靠信息与错误信息。
Securing the support of at least three major shareholders will be crucial to the success of the proposed merger.
获得至少三位主要股东的支持对拟议合并的成功至关重要。
写作加分
✨ 加分词
替换：importantvery importantnecessary
学术议论文政策分析话题教育话题
普通
Education is very important for economic development.
教育对经济发展非常重要。
加分 ✨
Investment in quality education plays a critical role in driving long-term economic development, as a well-educated workforce is better equipped to adapt to technological change and generate innovation.