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1·His mind would wander, and he would lose track of what he was doing.

他会心不在焉起来，忘了自己刚才正在干什么。《柯林斯英汉双解大词典》

2·You become so deeply absorbed in an activity that you lose track of time.

你是那么专注于一项活动，以致忘了时间。《柯林斯英汉双解大词典》

3·You lose track of time and there is nothing but the croissant in your life.

你忘记了时间，生活中除了牛角面包什么都没有。

4·Don't lose track of your goals.

不要迷失你的目标。

5·I quickly lose track of her.

我在人群中失去了她的踪迹。

6·What am I doing when I lose track of time?

我作什么的时候可以忘记时间的存在？

7·Never lose track of what you were hired to do.

永远不要忘记公司雇佣你的目的。

8·To make the most of time, lose track of it (flow).

充分利用时间，忘记时间(心流)。

9·Basic advice, but it's surprising how many people lose track of things.

这是最基本的建议，但是令人惊讶的是有那么多人竟然不知道这件事。

10·And, once you've broken it, you're probably going to lose track of your spending.

而且，一旦你找开零钱后，大概你对消费就会看不见了。