菌斑在牙齿被清洁之后就开始形成，它在1小时内就能达到可检测到的水平。

Plaque starts forming immediately after a tooth is cleaned; it takes about an hour for plaque to build up to measurable levels.

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其次，扩充了在稀相流动中，用图像法可检测到的流动参数内容，实现体积空隙率的检测。

Secondly, we expand the scope of detectable flow parameters by using image method in dilute phase flow regime, and achieve measurement of volume voidage.

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苯是原油中提炼出来的化学合成物，1928年两个意大利医生检测到一名工人因长达五年的时间里暴露在苯环境中而患有癌症，他们发现苯可引发白血病。

Benzene, a chemical compound refined from crude oil, was found to cause leukemia in 1928 by two Italian doctors who detected the cancer in a worker exposed to benzene for five years.

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