How did ancient civilizations keep track of time?
古代文明是如何记录时间？
It's difficult for him to keep track of time since he has no watch.
让他说出确切的时间是困难的，因为他没有手表。
Joe can't keep track of time and he's often late for important meetings.
乔不能掌握时间，重要的会议他总是迟到。
For each user account, I keep track of time used, along with other information.
对于每个用户帐户，我跟踪使用的时间，以及其他信息。
For each user account, I keep track of time used, along with other information.
对于每个用户帐户，我跟踪使用的时间，以及其他信息。
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