Divers should carry an easily activated noise maker that's clearly heard underwater.
潜水员应该都随身携带一个能在水下发出清晰可听见的大声音的东西。
He was inspired initially by the efforts of car-maker Lotus who were trying to develop a system that removed unpleasant road noise, while still allowing drivers to hear emergency sirens.
他为汽车制造商莲花所启发。莲花公司当时正视图研发出一种系统，以消除路上令人不悦的噪声，同时使驾驶员依旧能够听到警笛声。
When you are busy, a boy is a trouble-maker and a noise.
当你忙碌时，男孩儿会给你添乱，弄出噪音；
When you are busy, a boy is a trouble-maker and a noise.
当你忙碌时，男孩儿会给你添乱，弄出噪音；
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