A cold is an infection of the upper respiratory tract.感冒是上呼吸道的感染。She produced a feminist tract, "Comments on Birth-Control", in 1930.她1930年写了篇女性主义的短文《论节育》。A vast tract of land is ready for development.一大片广阔的土地可待开发。...
They battled against other Indian tribes, but rarely fought with the whites.他们同其他印第安部落作战，但很少与白人并肩对敌。He fought his bravest ( war ).他打得最勇敢.She has fought a constant battle with her weight...她一直在竭力控制体重。Watkins sued the Army...
Its nozzle was smeared with some kind of lubricant.它的喷嘴抹了某种润滑油。I think humor is a great lubricant for life.我认为幽默是人生的上好润滑剂。Most mechanical devices require oil as a lubricant.绝大多数机械装置都需要用油作为润滑剂。...
最幸福的人们并不一定什么都是最好，只是他们懂得欣赏生活的美好。The happiest are not those who own all the best things, but those who can appreciate the beauty of life.成功不是终点，失败也并非末日，最重要的是继续前进的勇气。Success is not final, failure is not fatal: it is the cou...