可以采用汽灯，因为此种灯能产生具有不同特征波长的光。
Vapour lamps can be used since they produce light of different characteristic wavelengths.
用途：用于镧钨、镧钼阴极材料，三元催化剂，石油化工，汽灯纱罩添加剂，硬质合金，难溶金属等。
Uses: used Lanthanum tungsten, lanthanum molybdenum cathode materials, ternary catalysts, petrochemicals, gas lamps mantle additives, alloy, refractory metals.
火车站就在附近，隔几个街区就到，坐落在峡谷边缘的黑暗角落里，而进站方向的铁轨在琥珀色的蒸汽灯照耀下却显得灯火通明。
At the distance of a short city block stood the train station perched in darkness on the edge of the ravine, while below the tracks were illuminated in the amber glow of vapor lamps.
火车站就在附近，隔几个街区就到，坐落在峡谷边缘的黑暗角落里，而进站方向的铁轨在琥珀色的蒸汽灯照耀下却显得灯火通明。
At the distance of a short city block stood the train station perched in darkness on the edge of the ravine, while below the tracks were illuminated in the amber glow of vapor lamps.
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