要表示一打,是用 a dozen 还是用 a dozen of,仿佛通常是不需要介词 of 的。如:
A dozen fighter jets took off from the aircraft carrier. 从航空母舰上起飞了十几架喷气式战斗机。
I bought a dozen eggs, six of which broke when I dropped the box. 我买了一打鸡蛋,六个在我失手掉了盒子时摔碎了。
不好意思,刚提交,发现曾老师已给出了非常不错的解答,请以曾老师的解答为准,谢谢!