For the abundant of noise in testing oil well depth with sound wave, it is difficult to locate the reflected sound wave.
在用声波测试油井油液面深时，反射声波受到大量杂波干扰，给接箍波和液面波的定位带来了极大的困难。
The oil well extended several hundreds of feet in depth.
油井向下延伸了数百英尺。
The depth of this oil well—5,000 feet (1,500 meters) below the ocean surface—has complicated all proposed mitigation efforts.
深入海面5000英尺（1500米）的油井使所有缓和污染的努力陷入困境。
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