英语释义

• membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo

• membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional

片语

yolk-sac larva卵黄期幼生

yolk-sac placenta翻译

yolk-sac umbilicus翻译

yolk-sac stage卵黄囊期

visceral yolk-sac脏层卵黄囊

yolk-sac endoderm卵黄囊内胚层

yolk-sac entoderm卵黄囊内胚层

英汉例句

• a human yolk sac is used briefly and then vanishes.

  人类的卵黄囊用得时间很短，很快就会消失。

• the yolk sac is gradually vascularized.

  卵黄囊逐渐被血管化了。

• there were 35 embryonal carcinomas, 11 teratomas, 3 yolk sac tumors, 6 choriocarcinomas and 13 mixed germ cell tumors.

  胚胎癌35例，畸胎瘤11例，卵黄囊瘤3例，绒毛膜上皮癌6例，混合性生殖细胞瘤13例。

• yolk sac tumor rarely involves the pericardium.

  卵黄囊瘤很少涉及心包。

• the progresses in study on yolk sac hemopoiesis as well as the proliferation, differentiation and regulation of the yshsc are reviewed in this paper.

  本文就卵黄囊造血及ys-hsc的增殖、分化及其调控机制的研究进展作一综述。

• the hematopoietic and vascular systems of the mouse arise from extraembryonic mesoderm that migrate through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.

  小鼠的造血和血管系统起源于胚外中胚层。胚胎期6.5-7天时在卵黄囊形成特征性的血岛结构发生向造血和内皮细胞的分化。

• the size of yolk sac is clearly different between normal pregnancy and abnormal pregnancy(p0.05) .

  卵黄囊大小在正常及异常妊娠组间有明显差异（p0.05）。

• objective: to explore ct image of yolk sac tumor out of gonad.

  目的：探讨ct在性腺外卵黄囊瘤的临床应用价值。

• by two months, the yolk sac becomes redundant and shrivels away.

  两个月的时候，卵黄囊就已经失去了作用，慢慢萎缩变小。

• i do not believe, however, that this is normal, since in the wild, young with such a large yolk sac probably would not survive without parental protection.

  我不相信，不过，这是正常的，因为在野生环境年纪这么大的卵黄囊，也许就不会生存父母的保护。

• conclusion ultrasonography testing yolk sac plays an important role in estimating pregnancy outcome in the early threatened abortion.

  结论卵黄囊在评估早期先兆流产结局中有重要价值。

• the results showed that more than80%of nutrition in yolk sac were utilized in59hours, which suggested that it was the main period of yolk sac utilization.

  结果表明，在59时龄以内80%以上的卵黄囊营养被吸收利用，说明这一时期是卵黄囊吸收利用的主要时期。

• its signals can also be detected throughout the surface of yolk sac as presented in pairs of spots.

  同时在卵黄囊表面也可以检测到均匀的呈点状分布的阳性信号。

• methods the yolk sac in 129 pregnant women were measured by ultrasonography, and compared in normal and abnormal pregnancy group.

  方法应用超声诊断仪观察129例早孕患者的卵黄囊的形态、大小，根据结果分为正常和异常妊娠组进行对比分析。

• 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。

• objectiveto explore the value of characteristic of gravidas' yolk sac in the early pregnancy outcome of threatened abortion.

  目的探讨卵黄囊声像图在早期先兆流产妊娠结局检测中的价值。

• methods: retrospectively analyzed clinical manifestation and ct image of yolk sac tumor out of gonad in 6 cases.

  方法：回顾分析6例经病理证实的性腺外卵黄囊瘤的临床及ct影像表现。

• conclusionatra could inhibit proliferation of yolk sac tumor cell line, and down regulation of vegf could be the inhibitory mechanism of atra on yolk sac tumor cell line in vitro.

  结论全反式维甲酸可以抑制睪丸卵黄囊瘤细胞的增殖，抑制肿瘤增殖机制可能与下调vegf的表达有关。

• along with the yolk sac absorption, stomach and duodenum, were differentiated 3 days post hatch, respectively.

  随着卵黄囊的吸收，仔鱼分别于孵化后第3天分化出胃和十二指肠；

• results methylmercury could pass through yolk sac placenta quickly, and inhibit placenta development and blood vessel differentiation there at higher concentration.

  结果甲基汞能通过卵黄囊胎盘，但高浓度可抑制胎盘发育和血管分化；

• the yolk sac is shrinking.

  该卵黄囊缩小。

• the experiment was conducted to study the nutrition absorption and utilization in yolk sac of fasting gosling.

  以扬州鹅初生雏鹅为试验对象，研究在绝食条件下雏鹅对卵黄囊营养吸收与利用的规律。