凡事应该用脑筋好好想一想.We should always use our brains and think everything over carefully.肯用脑筋的人永远胜过别人.A man who can think will always gain an advantage over others....
他赞成增加每天的课时并延长学年。He favors extending the school day and school year.该培训包括产科学和妇科学的增加课时。The training covers extended periods in obstetrics and gynaecology.他的航海教练在一次训练课时从船上失足跌入水中，溺水身亡。His sailing instructor fell overboard an...
The point of degradation, due to attenuation or distortion, at which a signal becomes unusable.由于衰减或失真使得信号变得不能使用的那个退化点.Mortality is the number or volume of trees periodically rendered unusable through natural causes.枯损是一...