keep track of
US /kiːp træk ʌv/
UK /kiːp træk ʌv/
1.
掌握, 跟踪, 记录
to stay informed about or be aware of someone or something, especially their progress or whereabouts
:
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It's hard to keep track of all the changes in the project.
很难掌握项目中的所有变化。
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Can you keep track of how many people enter the building?
你能记录有多少人进入大楼吗？