two dozen 還是two dozen of?

1.壹打，十二個〔作為實數及作修飾語時，復數不加 s〕。2.〔dozens〕 若幹，許許多多。two [three] dozen eggs 兩[三]打雞蛋。 four dozen of these eggs 四打這種雞蛋。 some dozens of eggs 好幾打雞蛋。 dozens of eggs 幾十個雞蛋。 some dozen (of) eggs 壹打左右雞蛋。 a dozen of eggs 壹打雞蛋。 sell eggs by the dozen 論打售蛋。 pack oranges in dozens 按打包裝橘子。 a round dozen 整整壹打。 a baker's [devil's, long, printer's] dozen 十三個。 dozens of times 屢次。 (talk) thirteen [nineteen] to the dozen 〔英俚〕 1. (說個)不停。 2. (說得)過分地，迅速地。