stop down
... 国外事务所 foreign offices in china 缩小光圈 stop down 操作系统内核 the kernel of operating system ...
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通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
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