relevant
与当前话题或目的直接相关(切题的)
pertinent
切题的,恰当的(比 relevant 更正式,强调「恰好对上点」)
Please focus on information that is relevant to the case before the court.
请聚焦于与法庭审理案件直接相关的信息。
The professor asked students to raise only pertinent questions during the lecture.
教授要求学生在讲座期间只提切题的问题。