因此,距离不会成为磁盘驱动器行业全球化的障碍。
Distance therefore poses no obstacle to the globalisation of the disk-drive industry.
用电来驱动相同汽车行驶相同距离的费用仅仅是汽油的四分之一到三分之一。
The cost of electricity is about one-third to one-fourth the cost of gasoline to drive the same car the same distance.
但这种电池价格昂贵,而能够驱动车辆所行驶的距离也很有限。
But they're expensive, and the distance they can power a car is limited.
So expansion work, for instance, or compression work, is if you have a piston with a gas in it. All right, you put a pressure on this piston here, and you compress the gas down. This is compression work.
力乘以距离,就是功,功有许多种:,电可以做功,驱动电机与电风扇,磁力也可以做功。
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