"take down the vase from the shelf"
"Her boyfriend let her down when he did not propose marriage"
1.
1. 放下,降低;使失望：let alone 不干涉;不碰 |letdown 放下;降低;使...失望 |let go 放开;释放;发射
2. 使失望：leave out 省略 |letdown 使失望 |let sb.down 让某人失望
3. 放下：let daylight into 明朗 |letdown 放下 |let drive at 对准打
她把百叶窗放下了。
let down a rope so that I can climb up.放下绳子，让我爬上去。
He won't let you down; he's reliable.他值得信赖，不会让你失望。
I feel let down by his indifference.他的漠不关心使我感到失望。
Don't let down even if the going is good.即使在顺利的情况下也不要松劲。
The horse let down near the end of the race and lost.那匹马在比赛接近终点时松了劲，结果输了。
She had to let down the child's skirt.她只得把孩子的裙子放长。
The girl let down her hair.女孩让头发披了下来。
A naughty boy has let down the back tyre of my bike.一个顽皮的男孩把我自行车后胎的气给放了。
Sadly, the film is let down by an excessively simple plot.遗憾的是，过于简单的情节使得这部电影令人失望。
He let down the tailgate so the dog could jump out.他放下后背门，好让狗跳出来。
But then to be let down like that, oh it's so unfair!但是接下来竟让人如此失望，唉，这真不公平！
Remove wheelnuts, let down tyre, put on spare.拧下车轮螺母，放掉车胎的气，换上备用胎。
He is a bit let down by the low grade he got.这次成绩不好,他有点气馁.
Don't let down even if the going is good.即便在顺利的情况下也不要松劲.
This struggle is sharp and complex. We can never let down guard.这场斗争是尖锐复杂的, 我们决不能掉以轻心.
Please let down the blinds.请把百叶窗放下来.
The company now has a large number of workers who feel badly let down.公司的很多工人现在都感到非常沮丧。
The flat was really very nice, but compared with what we'd been used to, it was a terrible let-down.这套公寓真的很不错，但比起我们以往住的地方，那就差太远了。
The sense of let-down today is all the greater because in the past doctors have been over-confident about these treatments.医生们过去对这些疗法过度自信，导致今天的挫败感尤其强烈。
When he sees me, he has just let down the receiver.当他看见我的时候, 他就放下了听筒.
They arrived, the carriage turned, the step was let down.他们到达目的地, 马车转过头, 踏脚板放了下来.
She let down a dress.她把衣服改长些.
The party was a big let - down.这个聚会令人大失所望.
