or derivatives thereof的用法和樣例：
例句
- It is applicable to substances or their derivatives which are volatilized under the temperatures employed.
氣相色譜法適用于在運用溫度下?lián)]發(fā)的物質(zhì)或其衍生物。 - The pesticide products of diketene produced by direct synthesis or biosynthesis were introduced.
介紹了由雙乙烯酮直接合成或由其衍生物合成的農藥品種。
