* The sprocket should be inspected for wear and replace it if necessary.
檢查鏈輪齒是否磨損,以便必要時(shí)加以更換。?
* Metallic surfaces should be greased and decrease friction.
金屬表面必須涂上潤滑脂,以減少摩擦。
* Open the key and an induced current in the opposite direction will be obtained.
如果把電鍵斷開,就會(huì)得到反相的感應(yīng)電流。
6. 當(dāng)and連接兩個(gè)含因果關(guān)系的并列句時(shí),往往表示兩個(gè)動(dòng)作或事情發(fā)生的先后順序,這時(shí)and可譯為“因此”、“因而”、“從而”、“所以”等。如:
* A fly wheel stores energy and evens out fluctuations in the speed of the engine.
飛輪可儲(chǔ)存能量,因此可使發(fā)動(dòng)機(jī)的速度波動(dòng)平穩(wěn)下來。
* 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.
有些類星體接近人們所能觀察到的空間和時(shí)間極限,因而有可能用來對彼此對立的宇宙理論作出有決定意義的檢驗(yàn)。
* Some speculate that drug abuse, chronic stress, or intestinal parasitic infections may weaken the immune system and allow AIDS a foothold.
還有ー些研究人員認(rèn)為,濫用藥物、長期精神緊張或腸道寄生蟲感染,會(huì)削弱免疫系統(tǒng),從而給艾滋病以立足點(diǎn)。
責(zé)任編輯:admin