Lethen.遗忘河；忘却；遗忘letv.让；允许；(用于祈使句表建议、请求、命令)让；假设；出租n.出租；阻碍；(网球等)触网重发Let's take a picture together?左右确定；左右特化Let's meet again on-line soon.左右出风口Let's go boating this afternoon.[医] 胃网膜左丛Let' s forget our disagreements.左室后负荷Let's have a three-course meal.左下肩岬骨缘Let Every Student Study Effectually让每位学生都有效地学习Let there be no misunderstanding.不要产生误会。Let us take everything seriously.让我们认真对待每一件事。Let's go downtown this afternoon.左肾静脉压迫Let's meet each other half-way.左三角范畴

1. He refused to let up on the boy until his school grades improved.
   直到那孩子学业有了进步他才肯放宽他对他的管束。