重点讲解：
1. be good at 擅长的；精通的；能干的；
例句：Most of the students in this class are good at mathematics.
这个班的学生多半数学很好yPw1R6=;ifx)i=-~Z4。
2. used to do sth. 过去常常；过去曾；
例句：I used to stay up late with my mom and watch movies.
我以前总是和妈妈一起熬夜看电影%zLx|kTBR_K*eIHns7)。
3. make sure 一定要；设法保证；
例句：You have to make sure you're comparing like with like.
你必须确保是在进行同类比较g5~tq4;IzP5k,0x=t@K。
4. get adapted to 适用于…的；适合…的；
例句：The Indians had to get adapted to a new climate as they moved south.
当印第安人往南迁移时,他们必须习惯新气候q;d*rY1.QBAU。