在实验室里，健康的成年人大脑神经元的寿命通常不超过几个小时，因此不可能被广泛的研究。

In laboratories, healthy adult human brain neurons typically live no more than a few hours, making extensive research impossible.

youdao

我现在仍然在早上工作得最好(虽然不总是那么早)，所以我尽量把这几个小时保留作为我的写作时间。

I still do my best work in the mornings (though not usually that early), so I try to keep those hours for my writing.

youdao

一般来说，只要停电不超过几个小时并且冰箱里的温度仍然保持在华氏40度或以下，冰箱里的食品都是安全的。

Generally, food in the refrigerator is safe as long as the power is out no more than a few hours and the temperature in the refrigerator remains at 40 degrees farenheit or below.

youdao