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Compared the similarity and difference of distribution of homologous fragments on X and Y, we suggested that the sex chromosomes of spiny eel have evolved from a pair of homologous ancestral chromosomes, and during the evolution, a pericentric inversion might have occurred on the original Y chromosome, and subsequently terminal regional duplication might have followed, eventually resulting in the differentiation and formation of X and Y chromosomes, then the recombinants between sex chromosomes were repressed, so the sex chromosomes could be inherited steadily.

根据X、Y染色体上同源片段的分布的相似和相异，我们对刺鳅性染色体的分化历程进行了推测，即：刺鳅的性染色体起源于一对原始的同源染色体，通过原Y染色体上的一个明显的臂间倒位，以及染色体末端的异染色质成分的扩增，导致原始Y染色体与X染色体在染色体结构上的分化，从而抑制了X、Y性染色体之间的遗传物质的重组交换，为性染色体的稳定遗传奠定了基础。

Both of them originated from the protodermal cells and formed four cells through two successive periclinal divisions.

两类表皮毛的原始细胞均起源于叶原基或幼叶的原表皮细胞，经过两次垂周分裂形成四细胞。

Be in this traceable wall street, sweep across the whole world " financial seismic sea wave " in, the wall street with infinite in former days scene 5 cast greatly all meet with all right adversity -- break down 3 times, additionally two change permissibly body in an attempt to is put.

在这场起源于华尔街、席卷全球的&金融海啸&中，昔日风光无限的华尔街五大投行均遭厄运——三家垮掉，另外两家获准变身以求存。

The Po is a polearm derived from the short sword.

铍是一种起源于短剑的长柄兵器，它的形式曾经五花八门。

A feminist geography, originating in the late 1970s and flourishing in the 1990s, aims "to investigate, make visible and challenge the relationships between gender divisions and spatial divisions, to uncover their mutual constitution and problematize their apparent naturalness."

女权地理学研究（起源于上世纪七十年代末，流行于九十年代）就正是要考察、揭示和质疑性别对立和空间分配之间的关系，指出二者实际上互为构成，都并非天然形成。

It is significant that the origin of bricks came from an area where there was little timber or easily quarried stone.

砖块起源于一个几乎没有木材和容易开采石矿的地区的现象是值得注意的。

The results indicated that two-rowed wild barley resources from above two regions are similar at characteristics of life cycles,brittle rachis,shape of flowering glume of trispikelets,hair length of rachilla,pedicel of lateral spikelets,g...

结合他人有关染色体和核型等有关报道，认为它们可能起源于共同祖先，即有真正野生群落的原始野生二棱大麦。

Radish (Raphanus sativus L.) is an important commercial vegetable, China is the mainplace where radish was origined and domesticated, and has abundant germplasm.

萝卜是起源于中国的一种重要的蔬菜作物，种质资源十分丰富。

The Roma are a distinct ethnic minority, distinguished at least by Rom blood and the Romani, or Romanes, language, whose origins began on the Indian subcontinent over one thousand years ago.

一千多年前，吉普赛起源于印度次大陆，它是一个独特的少数民族，至少可以根据Rom血统及语言来辨认它。

The results show that the secretory ducts are schizogenous cavity which are only distributed in the stem and the leaf.The initial of the secretory duct drives from the ground meristem.

结果表明，分泌道为裂生腔隙，只分布于茎和叶中；分泌道原始细胞起源于基本分生组织；分泌道原始细胞团裂隙的扩大靠鞘细胞的插入和上皮细胞自身的切向伸长；成熟的分泌道呈圆形或椭圆形，由一层上皮细胞和其外的1 ～2 层鞘细胞包被。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。