重点讲解：
1. as far as sb./sth. be concerned 就…而言；
The keyboard is a large and clumsy instrument as far as portable computers are concerned.
就手提电脑而言，键盘就显得大而笨重了-eIWk)9m!0。
2. back off 放弃，收回；
And you'll back off if it doesn't go your way?
如果大部分人都不赞同，那么你会停止？
3. it's up to sb. to do sth. 由…负责；
It is up to the regulating authority to put the measures into effect.
应该由管理部门落实这些措施=+5V!Oc_pshrTUB0Jn。
4. a couple of 两个；几个；
She already has a couple of good wins under her belt.
她已将几项冠军收入囊中Piid-D44Z^。