別哭了。 Don't cry.
擦擦眼淚。 Wipe your tears.
振作起來(lái)! Cheer up!
盡你最大努力! Do your best!
好好干! Do a good job!
給自己一次機(jī)會(huì)碰碰運(yùn)氣吧! Take a chance!
堅(jiān)持下去！Keep at it!
要有信心！Keep your chin up!
再加把勁! Try harder!
別認(rèn)輸!/別放棄! Don't give up! 它和hang in there的意思幾乎相同，只不過(guò)這種說(shuō)法比較直接。
絕對(duì)不能放棄! Never give up!

只要你想做，你就一定能做得到。
You can do anything if you really want to.
You can do anything if you put your mind to it.
You can do anything if you are so minded.

那才是好樣的！That's the spirit!
只要有信心，什么事都辦得到。You can accomplish anything if you believe in it.

再試一遍。
Try again.
Have another try.
Do it again.
Give it another try.