They and the other monkeys must be followed still longer, however, to know whether low-calorie intake can increase both average and maximum lifespans in monkeys.

然而，它们和其他猴子必须被跟踪更长的时间，以了解低卡路里摄入是否可以延长猴子的平均寿命和最长寿命。

youdao

'Eat' has the selectional restriction that it must be followed by a kind of food, so 'I eat sky' is not possible.

eat一词之后限跟某种食物，所以不可能说I eat sky。

《牛津词典》

They must be followed instantly to get them back again.

必须立即跟着他们，让他们回来。

youdao

Safety directions that come with heating equipment must be followed.

VOA: special.2010.02.02

Remember, "is it okay" must always be followed with either "if" or "to".

记住，使用“is it okay”时后面一定要跟上 "if" 或者"to"。

Is it okay 课堂 - SpeakingMax英语口语达人

But he told VOA the military action in Kandahar must be followed by swift political and structural changes.

VOA: standard.2010.05.28

But that bright, shining impulse, that very American impulse, must be followed by steely-eyed calculation.

WSJ: The Presidential Wheel Turns

Read carefully, because tax rules must be followed conscientiously and the sequence gets a little complicated.

FORBES: Paying For College: A Tax Dodge For College Students

There are international guidelines which must be followed when any animal is being reintroduced.

BBC: Beavers believed to be on loose