direct oxidation的用法和樣例：
例句
- Direct oxidation of toluene is a simple and cheap production technology of benzaldehyde.
摘要甲苯直接氧化製備苯甲醛是一條最為簡單而經濟的生產工藝。 - Trichloroacetyl chloride has been synthesised by direct oxidation of tetrachloroethylene with oxygen in the presence of ultraviolet light.
在紫外光催化下，以四氯乙烯為原料，直接氧化合成三氯乙醯氯。
