重点讲解：
1. roll out
推出；公布；
例句：The new model is to be rolled out in July.
这种新型号将在七月份推向市场&FZ*_~8ZAdL2&]7wL+。
2. call on sb. to do sth.
要求：呼吁：号召；
例句：I also call on all people in society who are capable of supporting them to love those children.
我也呼吁所有能支持到他们的人去关爱这些孩子DZXNKoCGrIYU+GJcoI。
3. so as to do sth.
（用于引出原因）为了；以便；
例句：The test questions are kept secret, so as to prevent cheating.
为了防止作弊，考试的题目是保密的em~!B0;WJcBK[icFuG|。
4. instead of
代替…；而不是…；
例句：Instead of making progress, my work actually seems to be going backwards.
我的工作不但没有进步，实际上像是在倒退mEpmoH9pm4_*。