0 a part of a plant or animal that is like a bag and often contains liquid -- （动植物的）囊，液囊
1 a type of abscess (= swollen area containing a thick yellow liquid) under the skin -- 脓肿
2 a covering that surrounds a tumour -- （肿瘤的）囊膜
The everted sac experiments are prone to methodological errors, especially damage caused by the everting procedure, but we took great care to minimize these.
No trematodes were observed in the lung or air sac, heart, liver, spleen and kidney of all bats and swallows.
To bypass some of the potentially complex requirements for fertilisation, we used isolated embryo sacs rather than isolated egg cells.
The visceral yolk sac, allantois and amnion were dissected away from the fetal material and excess fluid was wiped clear prior to measuring the weight.
The exocoelomic cavity contains the yolk sac, which is connected to the primitive digestive tract and fetal circulation.
Tested organs include lung or air sac, heart, spleen, liver, kidneys and intestine.
Various-sized blebs developed in the area between the oral sucker and ventrogenital sac.
This in turn was shown to depend on the growth rates of the embryo and embryo sac, both of which differed between genotypes.
