K-1：keep one's chin up 不灰心
A:I find physies the hardest thing for me.
A:我觉得物理对我来说太难了。
B:Keep your chin up, You'll get the hang of it.
B：别灰心，你会找到窍门的。
A:I've tried many times, but there's no way.
A：我试了很多次，但是毫无办法。
B:I bet you can make it.
B：我打赌你能行。
