线粒体约含1 000种左右蛋白质，其中98%以上系由细胞核编码，在细胞质核糖体上以前体形式合成之后再运至线粒体并选分定位于各部分。

About 98% of the 1 000 or so mitochondrial proteins are encoded in the nucleus and synthesized on cytosolic ribosomes as precursors, which are then imported into mitochondria.

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三分之一无子女的受调查者选儿子，三分之二的人没有偏好，只有不几个人选择了女儿。

One third of those without children said a son, two-thirds had no preference and only a residual said a daughter.

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此外，冉阿让选了一个合适的住处，他在这地方，似乎十分安全。

Moreover, Jean Valjean had chosen his refuge well. There he seemed perfectly secure.

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Pick a time. Let's say, if I go a quarter of a circle, I expect to be moving to the left.

选一个时间,例如我走四分之一圈,我想向左走

耶鲁公开课 - 基础物理课程节选

But it turns out actually over a third of people who took this class last year took the class because they felt depressed.

但是结果是去年有超过三分之一的人,选这门课是因为他们感觉抑郁。

哈佛公开课 - 幸福课课程节选