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 go downstreet after supper.左连续函数Let's organize a volleyball team.左旋偏振波Let blind feelings Olympic stadiums让盲人感受奥运场馆Let's go shopping together later.左递归非终结符Let's play football after school.左房增大Let's set aside all formali-ty.左心室射血前期Let's lash outand have champagne.左手材料Let's meet the problem head-on.左心房排空指数Let's forget about those worries.左表示模Let's consider the possibilities.左心瓣膜疾病