Souring
v. 变酸；发酵；变质（sour的现在分词）
🗣️ 情景例句
Nowadays many people go traveling for the holidays.
下面许多人都在假期里去度假。
Mr. Smith, would you like to start things off?
史密斯先生，你要开始做事了吗？
She watched TV for half an hour after supper. Then she started her homework.
晚饭后她看了半小时电视。然后她开始做家庭作业。