重点讲解：
1. at the same time 同时；
例句：He may be very rude sometimes but at the same time he is very kind.
有时候他可能很粗鲁，然而他还是很善良5E3Gp;9u4W]DMv*#Zqv。
2. because of 因为；由于；
例句：The sea was choppy today because of the windstorm.
今天起了风暴，海上波涛汹涌5VgODJP1jS%e。
3. find out (尤指特意通过努力)发现，找出，查明；
例句：My greatest dread is that my parents will find out.
我最担心的就是父母会察觉出来awWVNSQx3!+i%._qwH)。
4. depend on 取决(于)；有赖(于)；
例句：It would depend on what is on the list.
这要看列表内容,;#tI;Tx@+i4bMLGN。