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.
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。
The sun's just come out; you'll have to stop down a bit.
太阳出来了，你得把光圈收小一点。
Can let him who in the wind and rain fights stop down rest a while?
能不能让风雨中搏斗的他停下来休息一会儿？
我们要不要把光圈缩小一点?。
There's a bus-stop down the road.
路的前方有一个公共汽车站。
There's a bus-stop down the road.
路的前方有一个公共汽车站。
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