It was very dark inside: I could see nothing except a flaring gas-jet that illuminated a patch of plaster wall, throwing everything else into deeper shadow.
里面很黑，什么也看不见，只有一盏煤气灯照亮了石灰墙上的一片地方，别的全隐没在更黑的阴影中。
2
Patch on the tongue, lips, gums, or other area inside the mouth.
在舌头、唇、牙龈、或口腔内的其他部位产生疮口，有时会很疼。
3
They form where giant loops of magnetism, generated deep inside the sun, well up and burst through the surface, leading to a localised drop in temperature which we see as a dark patch.