backbone: 基本意思为:脊骨，脊柱，引申为支柱。也可表示"勇气，胆量"，相当于courage, 为不可数名词。
例句:
1. 说某人很怂，不敢去追女生
He has a crush on Srash, but he doesn't have the backbone to ask her out.
2. Nobody on the Chongqi bus had the backbone to intervene and prevent the middle-aged woman from assaulting from the driver. If somebody did, the story would have turned out very differently.
3. He has enough backbone to take up the Ice Bucket Challenge.
作业:
1. 翻译:
He didn't have the backbone and gave up the scholarship application at the last minute.
2. 场景: 我们应该要有追求幸福的勇气。
We should have the backbone to pursue happiness.
