例句與造句

1. surface active agents-gas chromatographic trace determination of free ethylene oxide in ethoxylates; german version en 13320 : 2002
   表面活性劑.采用氣相色層分析法對乙氧基化物中游離環(huán)
2. It's difficult to find trace determination in a sentence. 用trace determination造句挺難的