汽灯

qì dēng zhào

汽灯罩

gas mantle

kě yǐ cǎi yòng qì dēng yīn wèi cǐ zhǒng dēng néng chǎn shēng jù yǒu bù tóng tè zhēng bō cháng de guāng

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 wave lengths.