1.捣蛋;耍脾气;胡闹
2.出毛病,通常指疾病发作或是机器运转不正常
1.if children act up, they behave badly
2.if a part of your body or a piece of equipment acts up, it starts to become painful or to develop problems
1.If you act up to your promise , we are going on cooperating with you .
如果你遵守你的诺言，我们将继续同你合作。
2.The engine began to act up and he thought he would have to hit the silk.
引擎开始失灵，他心想非要跳伞降落不可。
3.And American judges and lawyers deny (not always plausibly) that they act up for the camera.
并且美国法官还有律师们否认（不是总可信的）他们在摄像机前举止不端。
4.She is to be back in one miute, but I never act up in the car, you should try.
她立马就回来了。但是那以后我再也没有在车里调皮了，你应该试一下
5.To "act up, " is a two-word phrasal verb meaning to have problems or to create problems.
“actup，”是两个单词的动词短语，意思是有问题或产生问题。
6.What you say means very little unless you act up to it.
你要是说而不做，你的话就没有意思了。
7.Sometimes they walk away. Sometime times they act up and fore you to take a stand. Sometimes they die.
有时候他们离你而去，有时候他们故意找茬而逼的你要奋起反抗，有时候是因为他们逝世。
8.Man, it was only a joke. You didin't have to act up like this.
老兄，那只是开玩笑的，你用不着气成这样。
9.Sometimes they die, sometimes they walk away, sometimes they act up and force you to take a stand.
有些时候，他们去世了，有些时候可能离开了，有些时候他们可能扮演了一个让你的角色。
10.Much like a computer, we only have space for so much, until our own hard drive (mind) starts to act up.
就像一台电脑，除非电脑的硬盘坏了（这里是我们的大脑），否则会用空间来存储大量的信息。