gas arc lamp的用法和樣例：
例句
- It's more economical to use gas than coal.
燒煤氣比燒煤上算。 - Coal will be replaced by gas sooner or later.
煤遲早將被煤氣來代替。 - The arc lamp is very useful in movie shooting, and screening.
弧光燈在電影拍攝和放映的過程中有很大的用處。 - He found Franklin, for instance, trimming arc lamps in an Ipswich factory for a few shilling a week.
例如，他發現富蘭克林在伊普斯威奇市的一家工廠里做裝飾弧光燈的工作，一星期只賺幾個先令。
