In land animals, saliva contains mucus, and provides lubrication for food in the alimentary canal.陆上动物的唾液内有粘液, 并对消化道内的食物起着润滑作用.In metal lubrication two distinct regions are recognized: boundary and hydrodynamic.在金属的润滑作用中...
Lubrication reduces noise and wear.润滑作用能减少噪音和磨损.We shall require more lubrication oil this month.这个月我们需要更多润滑油.Sludge can also clog oil passages and prevent normal engine lubrication.油泥还会阻塞油路,妨碍发动机的正常润滑工作....
And there is the dread of the unknown, above all , the awful fear of hellfire.而且还有对未知的恐惧; 尤其是对于炼狱的惧怕.I would go through Hellfire if I could but get free from sin at last.我决不怕到地狱里去赴汤蹈火,只要最终能够洗净罪孽.Hellfire Torch Firestorm ...
Ancient GREece produced many well - known historians such as Herodotus, Thucydides, Xenophon, such as Polley than Oslo.古代希腊产生了许多著名历史学家,如希罗多德 、 修昔底德 、 色诺芬 、 波利比奥斯等.But Herodotus is too alluring a companion for one who wou...
Li Shizhen was the originator of the Chinese pharmacology.李时珍是我国医药界的鼻祖.Li of marvellous ocean living things : Do Ascidian sea lily, you know several?海洋里奇妙生物: 海鞘海百合, 你知道几个?Li Chuang - fei inquired of Han Meng - hsiang in ...
讨论这个问题时, 我们应该抓住分歧点.In discussing this problem, we ought to keep to the point at issue.我们再次来到了历史上的分歧点.We have reached another bifurcation point in history....