Monoprop
丙酸
??? 情景例句
Cooking dinner for the entire family is not so easy.
給全家人做晚餐真不是件容易的事。
The truest politeness comes from sincerity.
真正的殷勤出于真誠。
Because the equipment for adding sound to films had not yet been developed.
因為給電影配音的設備還沒有研制出來。