They must also keep swimming to keep from sinking, since most have largely or completely lost the swim bladder, the gas-filled sac that helps most other fish remain buoyant.
它们还必须不停地游动以避免下沉，因为大多数鱼基本上或完全失去了鱼鳔，这个充满气体的囊帮助大多数其他鱼保持浮力。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Some of the models contained an air sac.
其中一些模型含有气囊。
It's like saying the blue whale is in an evolutional cul-de-sac because it lives in the ocean.
(派克汉姆的言论)就好比说蓝鲸钻进了进化死胡同，因为它们生活在海洋。
Perhaps we are really talking about amniotic fluid, which surrounds the foetus in the birth sac.
也许我们真正在谈论的是羊水，也就是包围着胎儿的那些液体。
The sac is very strong, like a balloon filled with water.
这个囊很结实，就像是装了水的气球。
The yolk sac and yolk stalk on one of them were well preserved.
观察了三例人胚外形，其中一例还有保存良好的卵黄囊和卵黄蒂。
All groups? Bacterial cultures of conjunctival sac were negative.
用药组结膜囊细菌培养均为阴性。
When the baby is about to be born, the sac bursts and all the fluid runs out.
孩子要出生时，这个囊就会破，羊水就会流出来。
In the first method, one drop of this dilution is dropped into the conjunctival sac.
第一种方法是将一滴这种稀释液滴入结膜囊。
Gallbladder: Muscular membranous sac under the liver that stores and concentrates Bile.
胆囊：见于许多脊椎动物的肌性膜性囊，用以贮存及浓缩胆汁。
Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形，合点端功能大孢子发育成为蓼型胚囊。
Diverticulum: a pouch or sac branching out from a hollow organ or structure such as the intestine.
憩室，支囊，膨部：从肠之类的中空器官或结构上分支出来的袋或囊。
Unfortunately for investors, H-P looks to be in a strategic cul-de-sac from which there may be no exit.
对投资者来说，不幸的是惠普看起来处于一个可能没有出路的战略死胡同。
Worse was to come when tests also confirmed a tear in the amniotic sac, which meant the waters were leaking.
更糟糕的是，他们还检测到，羊膜囊也破裂了，羊水开始外流。
The chorion and amnion are foetal membranes that contribute to the placenta and the foetal sac respectively.
绒毛膜和羊膜是分别形成胎盘和羊膜囊的胎膜组织。
A similar sac is much bigger in other animals than it is in humans and is used to aid in digesting high cellulose diets.
在其它动物身上，类似的一个囊会更大一些，它是用来消化高纤维素食物的。
We cut across a cul-de-sac that says "do Not Enter," make a sharp left turn and maneuver down lanes of brick row houses.
我们抄近路穿过一个被标明为“不许进入”的死巷，来了一个急剧的左转之后钻进了砖房之间的小道。
Results:1) There is no embryonic tissue in gestation sac without or with little villous tissue in anembryonic pregnancy.
结果：1）枯萎卵妊娠的胎囊内只有囊液，没有胚胎组织。 妊娠囊外没有绒毛组织或绒毛组织较稀疏。
A mature embryo sac is composed of egg apparatuses (two synergids and one egg cell), central cells and three antipodal cells.
成熟胚囊包含卵器(由两个助细胞、一个卵细胞组成)，中央细胞及三个反足细胞。
They're also difficult to maintain because your navigation logic has to store information about how a user got to this cul-de-sac.
而且还难以维护，因为您的导航逻辑必须存储与用户如何到达此死角相关的信息。
This article reported a study of cadavers and abnormalities in the lesser sac for discussing the CT anatomy of the normal and abnormal lesser peritoneal sac.
本文对小网膜囊的尸体和病变的研究，来讨论小网膜囊正常和异常的CT解剖。
Though her children live on, thanks to Wilbur rescuing the egg sac she leaves behind at the county fair, Charlotte dies, as spiders do, at the end of the summer.
虽然威尔伯带回了夏洛留在农展会上的蛋，使她的孩子们都活了下来，但是夏洛死了，就像所有蜘蛛一样，死于夏末。
A small, pear-shaped muscular sac, located under the right lobe of the liver, in which bile secreted by the liver is stored until needed by the body for digestion.
胆囊梨状小肌肉囊，位于肝右叶下侧，在其中储存肝脏分泌的胆汁一直到消化时供给身体使用。
Conclusion The coronal plane is dominant for showing left gastropancreatic fold and the communication relationship between superior and inferior recesses of the lesser sac.
结论冠状断层是显示胃胰襞左部及网膜囊上、下隐窝间通连关系的优势断层。
Conclusion The coronal plane is dominant for showing left gastropancreatic fold and the communication relationship between superior and inferior recesses of the lesser sac.
结论冠状断层是显示胃胰襞左部及网膜囊上、下隐窝间通连关系的优势断层。
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