without letup短语¹³¹⁶²⁰⁺³ 例句 They pressed on without letup until they got to the top of the hill. 他们一鼓作气爬上山顶。《新英汉大辞典》 We should always learn new words and new sentence patterns while keeping practicing without letup. 要源源不断地补充新的词汇、新的句型，并且要坚持不懈地进行练习。 blog.sina.com.cn We must develop the advanced productive forces without letup. 我们必须坚持不懈地发展先进的生产力。 hotdic