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- The water pump is a relatively simple mechanism that requires little Service and Maintenance in normal operation. Some pumps require periodic lubrication. 水泵是比较简单的机械装置。在一般情况下运行,不需要维护。有些水泵需要定期进行润滑。
- Automatic recirculating lubrication for crank-shaft and centralized periodic lubrication system with pressure and oil level sensing to ensure trouble-free long life. 曲柄轴和中央周期润滑系统的自动再循环润滑油，它带有压力和油标感觉系统来保证没有麻烦的长期使用寿命。
- The ball joint is lubricated for the life of the vehicle and does not require any periodic lubrication. 球形接头永保润滑，不需要定期润滑。
- The gear reducers are sealed units requiring periodic lubricant change. 齿轮减速器是整体密封装置需要定期更换润滑剂。
- That period was a bright page in the history of Chinese literature. 那个时期是中国文学史上光辉的一页。
- Let us hope that the period of this injustice will be over soon. 让我们希望这个不公正的时期很快结束吧。
- Childhood is a period of rapid growth. 幼年是生长迅速的时期。
- He consulted the chronicles of the period. 他参考了这一时期的编年史。
- He had to decide within a given period. 他得在一定时间内作出决定。
- She has a detailed knowledge of this period. 她对这段时期的情况了解地相当详细。
- In that period auto sales hit a14-year low. 这时期汽车销售量达到14年来最低水平。
- In this period, unemployment reaches record levels. 这段时间的失业人数又达到了创纪录水平。
- Which period of history are you studying? 你正在学哪一段历史？
- Can you tell me the time period when it was stolen? 能不能告诉我大概什么时候被偷的？
- Chaucer wrote in the late mediaeval period. 乔叟写作的时代是中世纪末。
- She'll be away for an indefinite period. 她将离开一段时间，何时回来未定。
- This was the most difficult period of his life. 这是他一生中最艰难的时期。
- The meeting finally came to a period. 会议终于结束了。
- A period signals the end of a sentence. 句号表示一个句子结束了。
- She is publishing a history of the war period. 她有一部战争时期的历史著作正在印行。
