1.aim at 瞄准；针对；旨在

例句:I don't understand that girl's behavior. What's she aiming at?
我不明白那个女孩为什么那样干, 她的目的是什么?

2.climate change 气候变化

例句:Climate change is a universal problem.
气候变化是个世界性的问题。

3.talk about 谈论；讨论

例句:He was disinclined to talk about himself, especially to his students.
他不喜欢谈论他自己，尤其是当着他学生的面。

4.point out 指出；指明

例句:I should point out that these estimates cover just the hospital expenditures.
我应该指出，这些估算仅包括医院的费用。