她猛地扯掉他车上的雨刷。She tore the windscreen wipers from his car.挡风玻璃上的雨刷咔嗒咔嗒来回摆动。The windshield wipers clacked back and forth.汽车挡风玻璃上雨刷的速度是可变的.The speed of the windscreen wipers is variable....
Her routine was invariable.她的日常生活总是千篇一律。This process, however, was not invariable.但是, 这个过程并非始终不变.Reduced vigor or " inbreeding depression " is not an invariable consequence of inbreeding.降低生活力或 “ 近亲繁殖的衰退 ” 并不是近亲繁殖必然的后果....