重点讲解：
1. up and down
上上下下；来来回回；
eg. There's a lot of rushing up and down the gangways.
舷梯上许多人上上下下。
eg. He continued to jump up and down like a boy at a football match.
他不停地上蹿下跳，活像个足球赛中的男孩。
2. be able to do sth.
可以…的，能够做某事；
eg. Despite our disagreements, we have been able to find some common ground.
尽管我们存在分歧，但仍能找到一些共同点。
eg. Women seem to be able to multitask better than men.
女性似乎比男性更擅长同时做数件事情
3. be going to do sth.
将要，即将；
eg. I think it's going to be successful.
我认为这事会成功。
eg. I'm going to have to tell him the truth.
我得把真相告诉他。
