Being lonely for long periods of time is not a great feeling.

长时间的孤独并不是一种好感觉。

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These muscles become stronger, allowing the whales to dive for longer periods of time.

这些肌肉变得更强壮，使得鲸鱼潜水的时间更长。

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Sitting in one position for long periods of time is nor healthy.

长时间保持一种姿势并不健康。

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Drinking large amounts of alcohol over long periods of time has also been linked to a number of cancers.

VOA: special.2009.09.08

Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.

细胞生命期可以停止在细胞周期的某个点,并保持很长时间

耶鲁公开课 - 生物医学工程探索课程节选

A lot of these processed foods have very long shelf lives and therefore can be stored for long periods of time.

很多加工食品为了便于储藏销售,都有很长的保质期

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The disorder is characterized by frequent episodes of overeating in a short periods of time.

CNN: Food was 'only relationship that mattered'

Therefore, the optimum asset allocation to gold over long periods of time is zero.

FORBES: The Optimum Asset Allocation to Gold Is Always Zero

He had extended periods of time when he was out and that probably lengthened his career.

BBC: Tracy Austin on Venus v Serena