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。

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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。

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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。

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Despite being shot five times, the suspect, identified as Paul Ali Slater, still managed to get back into his SUV, but he drove off the road and crashed a short distance away.

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