Henry says there is not only a need to keep track of the nuclear weapons in the world.

VOA: standard.2010.08.06

So also, along those lines in terms of test taking, make sure you also box your answers and that you keep track of significant figures and that you also remember to include your units.

另外，既然提到了答题要求，我想提醒大家考试的时候务必标出自己的答案,保持有效数字的一致性,并且记得带上单位。

麻省理工公开课 - 化学原理课程节选

So we keep track of the types of questions that come up, unless I said something stupid in class or been confusing, certainly.

所以我们对出现的各种各样的问题保持联系，除非我在课程上说了一些愚蠢的,或令人困惑的话。

哈佛公开课 - 计算机科学课程节选

"We know that this is already happening in remote clinics, for example in Rwanda, where cell phone-based technologies are being used to keep track of dispensation of drugs to patients with HIV,"

VOA: standard.2010.02.24

In binary search-- ah, there's that wonderful phrase, this is called a version of binary search just like you saw bin-- or bi-section methods, - when we were doing numerical things- in binary search, I need to keep track of the starting point and the ending point of the list I'm looking at.

就是当我们处理数字的时候，所称的二分检索，在二分法搜索中,我需要记录区间的开始点和尾点，初始化的时候就是-,问题输入的开始点和尾点，当我开始做测试的时候,我想要做的就是去取中值点。

麻省理工公开课 - 计算机科学及编程导论课程节选

He just sort of plunges you into their speech, into their lives, and you have to, in a sense, work to get into their character to be able to keep track of who is speaking.

他就是将你拉入他们的语言他们的生活，某种意义上来说你不得不，努力去进入他们的角色,以便了解是谁在说话。

耶鲁公开课 - 现代诗歌课程节选

Well, you can use what's called an array which is kind of a list or a little satchel of that you might physically carry that you can put things in again and again, and with an array can you actually keep track of not just numbers but any kinds of things, other sprites or other pictures, or perhaps a little something like this.

你可以使用数组,它其实是个列表,或者说是个小包,你可以把东西一个个放到里面，通过数组你可以保存任何种类的变量,图片或者像，这个例子中的一些小变量，而不仅仅是数字。

哈佛公开课 - 计算机科学课程节选