Jac
abbr. 飞机制造联合委员会（oint Aircraft Committee）
🗣️ 情景例句
you have so much energy and so many years of experience.
你精力这么好 ，又有这么多年的经验。
How long will it take you to make it?
你要多久才能做好它？
He is in his everyday clothes.
他穿着平常的衣服。