But one day he heard a strange noise at his feet, and when he looked down to see what it could be, he saw a stone-cutter driving tools into his surface.

可是有一天，他听到脚下传来一阵奇怪的噪音，他往下看到底发生什么事，发现一个切石匠开动工具钻入岩石表面。

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Road surface, other traffic, wind noise and driving speed all contributed to the cacophony.

路面，其他交通工具，风声和行驶的速度都会不同程度产生刺耳的声音。

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Because its driving signal is surface acoustic wave, thus it overcomes the shortcomings of complex structure, difficult fabrication and miniaturization in normal ultrasonic motor.

由于其驱动信号是可以由结构简单的叉指电极激发的声表面波，因而克服了一般的超声马达结构复杂，制造困难以及小型化困难等缺点。

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Coastal fisherman know that when a flock of seagulls is circling and diving into the sea a school of bluefish is often driving bait fish towards the surface and the anglers hasten to cast their lines into the frothy water beneath the screeching birds.

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Torque vectoring enables optimum use of the adhesion potential between the tyres and the road surface in all driving conditions, thereby extending the critical limits of the vehicle's driving dynamics.

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So far, it has only scratched the surface, with a clutch of measures to free up the professions and such small businesses as taxi-driving.

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