My family gave them to me because I have trouble keeping track of time.

我的家人把它们给了我，因为我记不住时间。

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Though we do it without thinking, keeping track of time is integral to the brain's function, keeping our senses and our actions ordered in a chronology that we then recall in the form of memory.

虽然我们并没有下意识地去做，记录时间轨迹却是大脑不可或缺的功能，当我们回想过去时，回忆中感觉和行为也是以时间顺序呈现。

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Begin keeping track of the time, and try to make dinner last at 30 minutes.

开始计时，并试着在半个小时内做出晚餐。

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The ancient civilization of Mayans lived in Mesoamerica since 2, 600 BC and had an extremely complicated and accurate method of keeping track of time based on three separate calendars.

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Titania had a hard time keeping track of all the mortal names, except for Beadle and Blork, but those were distinctive names, and actually rather faerielike.

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Most mobile robots do this using a technique called SLAM (simultaneous localisation and mapping), whereby they build up a map of their unknown environment, using various sensors, whilst keeping track of their current position at the same time.

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