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
In comparison with metal target LPP source, due to usage of gas-jet target LPP source, the reflectometer is debris-free and can continuously operate for a long time.