由上皮及间叶两个胚叶构成，状似胚胎肺。
Histologically they looked like the embryonic lung consisted of epithelial and mesenchymal elements.
大多数禾本科胚有一片瓣状结构通常称为外胚叶。
Most grass embryos have a flap-like structure known as the epiblast.
中胚叶节脊索类脊椎动物胚胎的中胚层的中间部分，…
The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.
目的：研究少汗性外胚叶发育不全引起先天缺牙的ED1基因突变。
Objective: To detect ED1 gene mutation in three hypohidrotic ectodermal dysplasia (HED) nuclear families.
背景和目的：骨巨细胞瘤来源于中胚叶细胞，其肿瘤组织主要由多核巨细胞和基质细胞组成。
Background and Objective:Giant cell tumor of bone(GCT) derived from mesodermic cell, consists mostly of multinucleated giant cells and ground substance cells.
资料与方法搜集5例骨原始神经外胚叶肿瘤的影像及临床、手术病理资料，分析其影像学表现。
Materials and Methods The radiological features, clinic and pathological data of 5 patients with bone PNETs were retrospectively analyzed.
结论溶骨性骨破坏和巨大软组织肿块是骨原始神经外胚叶肿瘤的常见影像学表现，病灶内钙化和局部淋巴结肿大少见。
Conclusion The osteolytic lesion and a large soft tissue mass are common radiological appearances of bone PNETs and calcification and regional lymphadenopathy are rarely seen.
包括平滑肌肉瘤48例，中胚叶混合瘤47例，癌肉瘤8例，葡萄状肉瘤4例，内膜间质肉瘤37例，纤维肉瘤1例，恶性淋巴瘤8例。
Of the 153 cases, 48 were leiomyosarcomas, 47 mixed mesodermal sarcomas, 37 endometrial stromal sarcomas, 8 carcinosarcomas, 4 sarcoma botryoides, 1 fibrosarcoma, and 8 malignant lymphomas.
按照数学家们的分类，三叶形是最简单的纽结。 所谓纽结，它是三维空间中不与自己相交的封闭曲线，或者说是三维空间中与圆周同胚的图形。
The trefoil is the simplest knot in mathematicians' classification.
野牛草组织培养的外植体有幼苗片段、叶基、雄花幼穗和成熟胚等。
In Buffallograss tissue culture, seedling segment, leaf base, mature embryo and immature male inflorescences can be used as explant.
在安全性评价中，红细胞溶血试验和鸡胚绒毛尿囊膜试验的结果均表明该汉麻叶提取物无明显刺激性。
In the safety evaluation, the results of red blood cell hemolysis test and chorioallantioc membrane experiment showed that the hemp leaf extract was not irritative.
并多数发生于于叶与下胚轴的深层。胚性细胞团周围细胞退化，使其与周围组织之间形成间隙。
The surrounding cells of the embryonic cell groups degenerate, such there is the space between the groups of cell and the surrounding tissue.
用透射和扫描电镜观察了蕨状满江红茎尖、成熟叶腔内以及胚的腺毛超微结构。
The ultrastructure of Azolla filiculoides was investigated by means of transmission and scanning electron microscopy .
用透射和扫描电镜观察了蕨状满江红茎尖、成熟叶腔内以及胚的腺毛超微结构。
The ultrastructure of Azolla filiculoides was investigated by means of transmission and scanning electron microscopy .
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