That's three hundred dollars including the necessary computer time.

300美元，包括必要的上机时间。

And how much is the course? That's 300 dollars including the necessary computer time.

这门课程多少钱？300美元，包括必要的上机时间。

To explain how ancient builders reduced the amount of time necessary to construct buildings from stone.

为了解释古代的建筑者如何减少了用石头建房所需的时间。

There are necessary times of retrenchment when, whatever we might desire, there seems no alternative but to stop.

有一些必要的紧缩时间，这时无论我们希望什么，似乎都别无选择只能暂停。

And how much is the course? -W: That's 300 dollars including the necessary computer time.

这门课程多少钱？-W: 300美元，包括必要的上机时间。

By the same token, good bosses will send messages when necessary, not every time a bright idea pops into their head.

出于同样的原因，好的老板会在必要的时候向员工传达信息，而不是脑子里一冒出好点子就开会。