查询词典 yolk sac

A sac or saclike bodily cavity, especially one containing a ''.

囊一种囊或囊状物，尤指任何含有粘性润滑''。

The sac structure projected through the pollen aperture possesses the typical nature of transfer cell, i. e complex lybrinthian wall ingrowth and abundant mitochondria, RER, dicotysomes and ribosomes under the wall. Its outer surface is closely related to the tapetal protoplast. The accumulation of storaged material in pollen start at the area near the apertures. Above restults indicate the pollen apertures may be the"door"from where nutrition flows into pollen in P. hortorum.

绒毡层物质向花粉粒的短途运输明显的表现在花粉的萌发孔区，一方面形成向外突起的囊腔，另一方面在这里具有发达的壁迷宫，而且迷宫下具丰富的线粒体，RER和高尔基体等细胞器，此外花粉内贮藏物的大量积累首先从萌发孔附近开始以及萌发孔处与绒毡层有紧密接触都说明天竺葵花粉萌发孔可能是物质进入花粉的&门户&。

There exists two kinds of mechanism on the thecal sac compressed by herniated disk,which may lead to different clinical symptoms.

髓核压迫硬膜囊存在占位和支撑2种机制，作用机制不同可能是导致临床表现不同的原因之一。

Any adhesions between the posterior longitudinal ligament and the anterior surface of the thecal sac are released by dissection.

分离后纵韧带与硬膜囊之间的所有粘着物。

These steps decompress the posterioraspect of the thecal sac.

这些步骤起到了减压的作用。

To compare direct measures of postoperative hematoma volume against a new measure of hematoma effect on the thecal sac: the critical ratio.

目标：比较术后直接测量血肿体积与一个新的血肿对囊壁作用标度的差别。

Once this is done, the thecal sac can be easily retracted to provide better exposure of the posterior portion of the vertebral body and the intervertebral discs.

经过这些操作后，就可以较容易的收缩硬膜囊以便显露椎体与椎间盘的后面部分。

Results. After decompression, 58% of patients developed epidural hematoma of sufficient magnitude to compress the thecal sac beyond its preoperative state at one or more levels.

结果：减压后，58%的患者发生了硬膜外血肿，血肿体积大，较术前在一个或多个节段压迫硬膜范围更大。

The critical ratio correlates more closely with the presence or absence of postoperative symptoms than measures of hematoma volume, and is consistent with the clinical expectation that greater thecal sac compression may result in more severe symptoms.

并且与临床上越严重的囊壁压迫会导致越严重的症状的猜测相一致。

Relative thecal sac compression due to hematoma was calculated at all levels where postoperative cross-sectional area was smaller than preoperative.

用术后及术前的横截面积计算硬膜囊受压率。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。