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(4) His arthritis began to act up again：(他的关节炎又犯了)

(3) His five-years-old daugther likes acting up before the visitors.(他... | (4) His arthritis began to act up again.(他的关节炎又犯了) | (5) When the chaps tease him ,he doesn't know how to act up.(当别...

act up to：遵守

act up to one's opinions 照自己主意做事 | act up to 遵守 | act up 调皮

act up to promise：履行诺言

act up to one's ideal 遵照某人的理想办事 | act up to promise 履行诺言 | act up to one's reputation 做符合某人声望的事

back-up air tank：备用气箱

back-up air supply 备用空气源 | back-up air tank 备用气箱 | back-up cooling 备用冷却

all up weight：总重量

all-up weight 总重 | all-up weight 总重量 | all-up weight 总重满载重量

AUW All-Up Weight：全重 , 总重 , 起飞重量

AUW All Up Weight 全重 | AUW All-up Weight 全重 , 总重 , 起飞重量 | AUW All-Up Weight 总重量 , 总飞行重量

Up beat anacrusis：弱拍起

Up beat 上拍,弱拍 | Up beat anacrusis 弱拍起 | Up bow 上弓

Who knows the answer? Put up your hand：谁知道答案?举起手来

(5)put up "悬挂,举起", 例如: | Mike is putting up a map on the wall. 迈克正把一张地图挂到墙上. | Who knows the answer? Put up your hand. 谁知道答案?举起手来.

arrive, appear on the scene ;come up in large numbers ;arrive in a vehicle：到场;出现;涌来;乘车到达

*His debts rolled up as he couldn 't pay... | 3.arrive, appear on the scene ;come up in large numbers ;arrive in a vehicle 到場;出現;湧來;乘車到達 | *The whole family rolled up to their daughter 's fir...

We can put up ten people for the night at a pinch：必要时我们可以留宿十个人

10. put up 举起;张开(伞);张贴;为......提供食宿 | We can put up ten people for the night at a pinch.必要时我们可以留宿十个人. | 11. put up with 忍受;忍耐;受苦

dioptric：折射光学的

dioptre 屈光度 | dioptric 折射光学的 | dioptrics 折射光学

Saturdays are fun：星期六很有趣

6. Saturdays are fun.星期六很有趣. | fun 为不可数名词,"快乐,有趣",在此做表语. | That must be fun. 那一定很有趣.