9. What a disappointment!
真让人失望！
还能这样说：
It let me down.
It made me feel somewhat disappointed.
应用解析：
great disappointment 大遗憾；
no disappointment 没有主见；没有失望；
avoid disappointment 避免失望
10. Well done!
做得很好！
还能这样说：
You are efficient.
You did a good job.
谚语：
He dances well to whom fortune pipes.
鸿运来时，百事顺逆。
11. Sometimes I fell rather lonely.
有时我觉得很孤单。
还能这样说：
I feel I am in solitude at times.
Loneliness occurs to me now and then.
应用解析：
feel one's age 意识到自己老了；
feel one's ears burning 觉得耳朵在发烧（认为或猜想有人在谈论自己）；
feel for sb. 同情某人
12. It's unbelievable!
难以置信！
还能这样说：
I can't believe it!
It is beyond belief.
谚语：
We soon believe what we desire.
自己希望的事，自己最容易相信。
13. Try it boldly!
大胆试试吧！
还能这样说：
Have a bold try!
Be bold and try it.
谚语：
Never try to prove what nobody doubts.
无人怀疑的事，无须证实。
14. Watch out!
当心！
还能这样说：
Be careful!
Take care!
谚语：
Good watch prevents misfortune.
谨慎消灾。
15. She is coming on to you.
她对你有意思。
还能这样说：
She shows interest to you.
She has a crush on you.
谚语：
First come first served.
先到先招待；先到先供应；先到先得。
16. How can I forget such a beautiful girl?
我怎么会忘记那么漂亮的一个女孩呢？
还能这样说：
I am not able to slough off the memories about the beautiful girl.
I can never get over the beautiful girl.
应用解析：
forget oneself 忘我，奋不顾身；失去知觉
17. Sometimes I am a lonely man.
我时不时也会觉得寂寞。
还能这样说：
I feel lonesome from time to time.
I feel lonely on occasion.