If lgA levels suddenly fall below a certain level, training is eased or dropped altogether.

如果 lgA 指数突然下降到某一水平以下，训练就会降低难度或完全取消。

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They know it will come. They know that it will be of a certain level of quality."

VOA: standard.2009.08.31

And so if one is looking to keep protein at a certain level, then these sort of foods would get favored.

但还不是全部 而如果要使体内蛋白维持在某种水平上,那这些食物会比较受青睐

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Cause and effect below a certain level of definition is blurred.

在某种程度的定义的下的,因果关系是模糊的。

麻省理工公开课 - 固态化学导论课程节选

So, at a certain level, you got to feel for, like, you know what?

NPR: Really Important Football Game Coming

Other games donate to a charity when players reach a certain level or other achievement.

FORBES: Donate To Charity Playing Branded Games With GamesThatGive

Employers may also match money an employee puts into their 401(k) up to a certain level.

FORBES: 401(k) Plan