经济学人下载:一周要闻 马云风波后首现身谈教育

The captain gave the order to abandon ship.

船长下令弃船。

2.theoretically 理论地

Theoretically, the price is supposed to be marked on the shelf.

从理论上说，价格是要标在货架上的。

3.launch 发射

The countdown has begun for the launch of the space shuttle.

航天飞机发射前的倒计时已经开始。

4.operation 运营

The system has been in operation for six months.

这个系统已经运行六个月了。