Monoprop
丙酸
🗣️ 情景例句
Cooking dinner for the entire family is not so easy.
给全家人做晚餐真不是件容易的事。
The truest politeness comes from sincerity.
真正的殷勤出于真诚。
Because the equipment for adding sound to films had not yet been developed.
因为给电影配音的设备还没有研制出来。