当我们考虑这些蝙蝠的夜间生活方式时，我们会发现，它们必须对不断变化的光线水平保持敏感，因为这是它们感知何时开始狩猎的方式。

When we consider the nightly lifestyle of these bats, we will see they have to be sensitive to the changing light levels because this is how they sense when to start hunting.

youdao

各家公司对于恢复以前的雇工水平保持谨慎。

Companies remain cautious about hiring at the levels they once did.

youdao

在很多国家，一般真实工资水平保持不变甚至还有所下降。

In many countries average real wages are flat or even falling.

youdao

If you wish to change sections, you may do so only with permission of the subject administrators because it's very important that those sections be kept at a small population.

如果你们想要改时间，你只能在课程管理主任允许,的情况下这样做,因为让课程的人数保持在比较少的水平,是很重要的。

麻省理工公开课 - 固态化学导论课程节选

Fundamentally, he left them low.

但税率大体上还是保持在较低水平。

斯坦福公开课 - 经济学课程节选