求中譯
屬句子
USDA Select (n = 40) and upper two-thirds USDA Choice (n = 40) beef carcasses
were used to determine the effects of postmortem aging on tenderness.
提問：
句子意思看的懂，請問 upper two-thirds USDA Choice (n = 40)該怎麼翻譯?
。Forty USDA Select and 40 upper two-thirds USDA Choice beef carcasses were...
。Select (n = 40) and upper two-thirds USDA Choice (n = 40) beef carcasses...
文章以此為主詞的句子出現兩次(如上)
原本以為意思是是「40具Choice等級的牛肉屠體中的前三分之二」，也就是n=40*2/3
可是下一句卻出現 (n = 40)，不知道該怎麼翻。
文章有時會出現 The upper two-thirds Choice muscles 為主詞的句子，請問又該如
何翻譯?
謝謝
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