How do you improve your life and find happiness when you're a teen-ager, and can't control much of your life?
青少年没有能力掌控自己的生活，那么他们应该如何改进生活、寻找幸福呢？
2
She looked like an American teen-ager, but the prospect of becoming one apparently terrified her.
从外表上看起来，她就像一位美国少女，但是成为一位美国少女的念头一定会让她手足无措的。
3
Evolution from ape to man runs a very long course, but is mankind teen-ager, or the entrance into old age today? And how will be the fate of human future?