1. talk about 讨论 谈论

例句：What are you talking about?

你们在谈论什么?

2.impress upon 使牢记；给…留下印象；留下印记

例句：I tell you this to impress upon you theabsolute power there is in taking the time to work on yourself.我告诉你这些事，让你对绝对的力量留下深刻的印象，让你抓紧时间为了自己而努力。

3.be familiar with 熟悉

例句：You should be familiar with how it works so you know what to expect.

您应当熟悉它是如何工作的，以了解会发生些什么。

4.hear about 听说 得知

例句：Yes, we hear about this all the time and and it does set us thinking as to who are better drivers?

没错，我们常常听到对于这个问题的讨论，不禁让我们要坐下来好好想想到底谁开车更好。