He's been tracking the number of people flying relative to the number of available seats.

他一直在追踪乘坐飞机的人数与可用座位数量的关系。

The train now departing from track number three is the nine-fifteen service to London King's Cross.

三号站台，前往伦敦国王十字车站的列车将于九点十五发车。

So he starts tracking the number of times he can lift the boulder up the mountain in a single day.

于是他开始记录自己一天能把巨石推向山顶的次数。

So your SmartWatch can track the number of steps you take, how many squats you took and your resting heart rate.

因此，你的智能手表可以跟踪你走了多少步，做了多少蹲坐，以及你的静息心率。

But instead of tracking numbers, vesicles are stamped with what's called a v-snare protein.

Hall：但不是追踪数字，而是在囊泡上印上所谓的 v-snare 蛋白。