They can tell the distance of various objects by how quickly the sound waves bounce back off them.
他们可以通过声波反弹的速度来判断不同物体之间的距离。
Reducing geographical distance in this way cuts milliseconds off the time it takes for buy or sell messages to be sent into or back from an exchange.
以这种方式拉近地理距离，让传送买卖指令的时间缩短了数毫秒。
The propeller is usually mounted on a mast behind the pilot and raised for take-off (or to gain more height or distance once airborne) and then lowered back inside the fuselage.
这种螺旋桨通常装在飞行员后面的一个桅杆上，起飞的时候升起（或在帮飞机实现更高的高度或航程的时候），随后收入机身。
I do not exactly know the distance, but when you get back to Portsmouth, if it is not very far off, you ought to go over and pay your respects to them;
我说不出确切的距离，不过你回到朴次茅斯的时候，如果不太远的话，你应该去看看他们。
I do not exactly know the distance, but when you get back to Portsmouth, if it is not very far off, you ought to go over and pay your respects to them;
我说不出确切的距离，不过你回到朴次茅斯的时候，如果不太远的话，你应该去看看他们。
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