A composite fiber Bragg grating based on pre-exposure technology is described in this paper.

报道利用预曝光技术制备的复合结构光纤光栅传感器。

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This strategy, known as pre-exposure prophylaxis, or PrEP, is based on the concept that blocking HIV's replication immediately after exposure to the virus may prevent infection.

这一策略被称为“暴露前预防”(PrEP)，是建立在这样的概念基础上：在接触病毒之后立即阻断HIV的自我复制可以预防感染。

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The speedlight will pre-flash that area and lock that exposure into memory. I might caution you that you have 16 seconds to then recompose and take the shot.

闪光灯会预闪并把曝光值记忆下来，注意你只有16秒的时间重新构图拍摄。

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In another trial called PrEP -- pre-exposure prophylaxis -- the CDC is also studying whether antiretroviral pills are safe and effective in preventing HIV infection.

CNN: Gel cuts HIV transmission rate in study

Though it is not yet clear whether such pre-natal exposure shapes taste-perception, there is evidence that it shapes preferences for foods encountered later in life.

ECONOMIST: Twin research

European Union banks' exposure to the UAE, and even UK banks' exposure, seems manageable, but adds to pre-existing vulnerabilities including Eastern European exposure.

FORBES: Doctor Doom