Souring
v. 变酸；发酵；变质（sour的现在分词）
🗣️ 情景例句
That's backbreaking work and may be too much for us.
这可是累人的工作， 我们可能负荷不了。
Yesterday it rained all day.
昨天整天下雨了。
It was simply a blank sheet of paper.
而是一张白纸。