重点讲解：
1. a while
一段时间；一会儿；
eg. It took her a while to get acclimatized to her new surroundings.
她花了一段时间才适应了新的环境。
eg. He moped around the office for a while, feeling bored.
他在办公室闲荡了一会儿，感到百无聊赖。
2. be able to do sth.
能做到…的；
eg. Individualists say that you should be able to wear what you want.
特立独行者认为人应该想穿什么就穿什么。
eg. I hope that everyone will be able to join in the fun.
我希望每个人都能够加入进来，玩得开心。
3. ins and outs
复杂详情；底细；
eg. I know all the ins and outs of our school building.
我知道我们教学大楼的一切情况。
eg. Dietary experts can advise on the ins and outs of dieting.
饮食专家可以对日常饮食的方方面面提出建议。
4. be in love
恋爱；相爱；
eg. Then I met someone and wham, bam, I was completely in love.
然后我遇上了一个人，嘭的一下，我就坠入了爱河。
eg. We were madly in love for about two years.
我们疯狂地热恋了大概两年。