pre-flash exposure
闪暴露
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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