Souring
v. 变酸；发酵；变质（sour的现在分词）
🗣️ 情景例句
He's been here for years, he should know the ins and outs of the job by now.
他在这里已经好多年，现在理应熟悉各方面的工作了。
All produets have to go through five checks in the whole process.
所有产品在整个生产过程中得通过五道质量检查关。
When I returned form abroad recently, a particularly officious young Customs Officer clearly regarded me as a smuggler.
最近一次，我也出国归来，碰上一位特别好管闲事的年轻海关官员，他显然把我当成走私犯。