[翻譯]oil sac 是什麼意思?

[ilovebebe ( 請盡速棄械投降)]

  the original setence:

        When purchasing a fresh duck, make sure the oil sacs in the tail
                                                   ^^^^^^^^^^

        have been removed before cooking.

        請問這要翻成"油囊"嗎?我是在是搞不懂

        煩請哪位英文達人幫忙解答吧!謝謝

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推 hemels:油囊 is fine
推 xoq:"sac"in French means "bag."