Then lets youdown

但转身却令你失望至极的那个人

Let down v.放下；使…失望；松懈；把(衣服)放长；披散；放气

例句：

She let down the blind.
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'd have it figured all out

我也曾全力以赴厘清

Figure out vt.算出；想出；解决；理解；断定

例句：

The boy can't figure out the algebra problems.
这个男孩做不出这道代数题。

It didn't take the children long to figure out the correct answer.
孩子们没有花很多时间就算出了正确的答案。

I can't figure out why he is absent.
我弄不明白他为什么缺席。