There are age limits and volunteers must be successful at mental and physical tests.

入伍是有年龄限制的，报名者需要通过身体和精神测试。

The study found that people who took an hour-long nap did much better on mental tests than those who did not nap.

研究发现，午休一小时者的体能测验结果比不午休的人好很多。

If you think about your parents and then give Mom and Dad a mental test on where they stand on each of the five traits, ten years from now Mom and Dad will still be there.

如果你想想你的父母， 然后对他们五个特征中的每一个进行心理测试，十年后， 爸爸妈妈仍将在那里。