Plaque is a sticky film of bacteria that covers your teeth and gums. It develops constantly and you clean it off every day when you brush your teeth.
牙菌斑是覆盖在牙齿和牙龈上的一层顽固细菌，并会不断增长，你需要在每天刷牙时清除掉这些菌斑。
You can wait for the natural process of evolution to take place and constantly practise your spatial activities until your brain develops sufficient connections.
你可以等着发生自然进化的过程，不断地进行空间活动练习，直到你的大脑开发出足够的线路。
The company constantly replaces the varieties of products and develops the new products to satisfy the different requirements.
公司不断开发替代产品和新品种的产品，以满足不同的需求。
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