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.
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.