oil sac 油囊 ; 油胞 ; 油腺
After it reaches its maturity, the whole volume of the oil cell is filled with the large vacuole, which becomes the oil sac subsequently.
当油细胞发育成熟后，细胞质及核开始解体，整个油细胞的腔由大液泡充满，成为油囊。
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There is a big oil ball on the surface of yolk-sac of perch.
胚胎卵黄囊表面有一个大圆形油球。
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