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The first stage in the process leading to such diversity is for the HSCs to become the precursor cells called multipotent progenitor cells.

导致这种多样性的步骤中，第一步就是造血干细胞发育成称为多能祖细胞的祖细胞。

The laboratory quantity of thiodiglycol, a mustard gas precursor, which we found at another site

我们在另一地点发现的、用于生产芥子气的thiodiglycol物质已经被销毁。

The laboratory quantity of thiodiglycol, a mustard gas precursor, which we found at another site, has also been destroyed.

我们在另一地点发现的、用于生产芥子气的thiodiglycol物质已经被销毁。

An immature cell of the bone marrow that is the precursor of a myelocyte.

成髓细胞，原始粒细胞骨髓的一种未成熟细胞，是髓细胞的前身

We evaluated spine health in 186 newly diagnosed children (median age 5.3 years, 108 boys) with ALL (precursor B cell: N = 167; T-cell: N = 19), who were enrolled in a national bone health research program.

我们对186例新诊断为ALL（前体B细胞：N =167；T细胞：N=19例）儿童（平均年龄为5.3岁，108例男孩）的脊柱健康作了评估，这些儿童被纳入一项全国性的骨骼健康调查计划。

The measures of prevention from N-nitro so compounds on the human health risk are mainly to reduce nitrosamines and its precursor nitrate and nitrite, and reduce nitrosamine intake and block the synthesis of it in vivo.

预防N-亚硝基化合物对人体健康的危害主要是：减少亚硝胺及其前体物硝酸盐及亚硝酸盐的摄入和阻断亚硝胺在体内的合成。

A siloxane precursor containing azobenzene dye and its synthesis are disclosed. In structural formula, R is nitrile, nitryl or chlorine atom.

本发明公开了一类含偶氮苯染料的硅氧烷先驱体，其结构通式如式1，其中，R为氰基、硝基或氯原子。

The nano-β-FeOOH for precursor of γ-Fe2O3 was synthesized by microemulsion method, then the β-FeOOH was calcined by mixing with additive polyoxyethylene nonyl phenyl ether (NP-4) in the molar ratio of β-FeOOH/NP-4 as 4, 5 and 100 respectively.

采用微乳法合成出氧化铁的前驱体－纳米β-FeOOH，分别以β-FeOOH与添加剂壬基酚聚氧乙烯醚(NP-4)以物质量的比为4， 5， 100添加NP-4，混合锻烧。

The Taichung Domain was moving northwestwards before the 1999 Chi-Chi earthquake: in the footwall of Chelungpu Fault the slip rate was ~10 mm/yr, while in the hanging wall the rate increased eastwards up to 10-30 mm/yr. Two years prior to the earthquake, in the footwall of Changhua Fault the deformation direction changed from WNW to almost due N, and velocity gradient changed from increasing northwards to increasing eastwards, suggesting possible precursor of a large earthquake.

中部地区在集集地震前大致向西北方向位移，车笼埔断层下盘位移速率约在10 mm/yr左右，断层上盘往东侧逐渐增大，在10~30 mm/yr之间；集集地震发生前2年，彰化断层下盘的位移方向由西北西转为偏北的位移型态，位移速度则由南向北增大，转为由西向东增大的趋势；即位移方向与位移速度有明显的改变，可能为地震前兆的相关资讯。

The eolutionary precursor to the backbone, the notochord is a fine, flexible chord defining the body axis in the early embryos of all ertebrates.

脊索是脊椎进化的前体，脊索在所有的脊椎动物胚胎早期起到柔韧轴的作用。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。