lost labour

• n. 徒劳

lost labour的用法和样例：

例句

用作名词 (n.)

1. It is lost labour to sow where there is no soil.
   没有土壤，播种也是徒劳。
2. He had tried vainly and lost his heart at last.
   他徒劳地尝试，终于失去了信心。