重点讲解：

1. be used to sth./doing sth. 习惯于；
例句：It doesn't frighten them. They're used to it.
这可吓不倒他们Q%=+Xa(+L)9zMp8i-I。他们已经习惯了h=yVty(qmq。
2. go back to 追溯到；回溯到；
例句：The feud with the Catholics goes back to the 11th century.
与天主教的夙怨可以追溯到11世纪8;g3[+dZ*YO|dh。
3. make sure 一定要；设法保证；
例句：Make sure that you follow the instructions carefully.
一定要认真按照操作指南来做lzf%CxZ]00p;。
4. on the side 作为配菜；
例句：Serve a bowl of warm tomato sauce on the side for dipping, if desired.
如果你喜欢，可以上一碗热番茄调味汁来蘸着吃Mo^Tm2Wd=)_#NH。