Salt helps to prevent decay in food.

盐用在食物之中，可以发挥防腐的作用。

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Spray on garbage to prevent decay odors.

喷雾，以防垃圾溃烂的气味。

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Of course a healthy tooth is the best tooth. So it is important to prevent decay. That's why sealants are so important.

当然，健康的牙齿是最好的牙齿。所以，防止牙齿受侵蚀是很重要的。这就是为何保护胶如此重要的原因。

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The report says scientific evidence suggests "almost every proven method to prevent decay includes delivery of fluoride to teeth surfaces".

BBC: Tooth decay in children too high, says chief dental officer

If the Earth is really 9, 000 years old, as Paul Broun believes and Rubio is willing to remain ignorant about, it becomes imperative to shut down our nuclear plants and dismantle our nuclear stockpiles now until such time as scientists are able to ascertain what circumstances exist that could cause deadly acceleration of radioactive decay and determine how to prevent it from happening.

FORBES: Why Marco Rubio Needs To Know That The Earth Is Billions Of Years Old

According to The Independent a brisk walk can help prevent mental decay in the over-sixties.

BBC: News | UK | 'Night of the short knives' disappoints press