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* The sprocket should be inspected for wear and replace it if necessary.
检查链轮齿是否磨损,以便必要时加以更换。
* Metallic surfaces should be greased and decrease friction.
金属表面必须涂上润滑脂,以减少摩擦。
* Open the key and an induced current in the opposite direction will be obtained.
如果把电键断开,就会得到反相的感应电流。
6. 当and连接两个含因果关系的并列句时,往往表示两个动作或事情发生的先后顺序,这时and可译为“因此”、“因而”、“从而”、“所以”等。如:
* A fly wheel stores energy and evens out fluctuations in the speed of the engine.
飞轮可储存能量,因此可使发动机的速度波动平稳下来。
* Some of quasi-stars lie near the limits of observable space and time, and promise to provide a crucial test of rival theories of the universe.
有些类星体接近人们所能观察到的空间和时间极限,因而有可能用来对彼此对立的宇宙理论作出有决定意义的检验。
* Some speculate that drug abuse, chronic stress, or intestinal parasitic infections may weaken the immune system and allow AIDS a foothold.
还有ー些研究人员认为,滥用药物、长期精神紧张或肠道寄生虫感染,会削弱免疫系统,从而给艾滋病以立足点。
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