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Ephedrine is both the raw material for medicine and the precursor for making methamphetamine (" ice" drug).

麻黄素既是制药原料，又是制造甲基苯丙胺前体。

By using the pseudo 3-D fKdV equation and division of four regions, theoretical mean wave resistance s and time change rates of the regional mean energy of the precursor soliton generation in a straight channel with arbitrary section are given theoretically.

利用准三维的fKdV方程和四区间划分法，理论给出了任意截面的直渠道中先锋孤立子生成的理论平均波阻和区间平均能量的时间变化率。

Prourokinase is not only a single-chain precursor of urokinase , but also one of the two human plasminogen activators.

尿激酶原是人机体内仅有的两种内源性纤溶酶原激活剂之一，为双链尿激酶的酶原前体。

The single-source ceramic precursor is synthesized by dimethylsulphide borane and dichloromethylvinylsilane and then pyrolyzed. The problem of this path, the elimination of by-product, NH4Cl, is discussed.

本文以甲基乙烯基二氯硅烷和二甲硫醚硼烷为原料，采用聚合物前驱体高温裂解的方法制备了SiBCN陶瓷，并分析了该路径的难点，即副产物的分离。

I have therefore generated several p130cas RNA interference transgenic lines to determine the possible function of p130cas during neurogenesis. Knockdown of p130cas expression in developing neurons resulted in partial fusion in the commissures axon fascicles of CNS, photoreceptor axon targeting and guidance defects, and bulged synapse boutons at the neuromuscular junction. Moreover, reduced expression of p130cas in sensory organ precursor cells and proneural clusters resulted in bristle development defects.

为了了解p130cas的功能以及更进一步的分析p130cas在神经发育过程所扮演的角色，我建立一系列可以执行RNA干扰技术的转殖果蝇，结果显示在果蝇的神经中降低p130cas的表现会造成腹部神经索中原来排列整齐的commissure axons神经束偶尔会出现不正常的融合；若将p130cas专一地在果蝇眼睛中降低则会造成果蝇视神经突触目标辨识与突触导向的缺陷；而如果局部的运动神经系统中降低p130cas的表现会造成在神经肌肉接点的神经突触有澎大的现象；此外在果蝇的感觉器官前细胞以及原神经细胞丛，降低p130cas的表现则会导致刚毛发育的缺陷。

This was supposed to be a spring of soup kitchens and breadlines in China's manufacturing heartlands, the potential precursor to a long, hot summer of industrial unrest threatening the government's vision of a "harmonious society".

按照人们的推测，在中国制造业中心，这将是一个赈济处和待救济者的春天，接下来可能是一个漫长、炎热、充满产业动荡的夏天，将会危及中国政府构建&和谐社会&的愿景。

Diasporas , such as the overseas Chinese , are a historical precursor to modern transnationalism.

散居，如海外华人，是一个现代跨国主义的历史性的先导。

For example, use of significant foreshocks, the most important precursor for Haicheng, was not applicable to the disastrous 1976 M 7.8 Tangshan earthquake Fig.

例如，采用意义重大的前震，对于海城地震最为重要的前兆，就不适用于灾难性的1976M7.8级唐山地震（图1）。

Yuzhou God in the town of Hou and Chang Yu Cun Zhuang and pale, etc., has unearthed in black, brown glaze kiln Huaci temperature was ceramic scientist known as "Jun Tang", which is a precursor to the Song Dynasty Jun chinaware.

在禹州市神垕镇下白峪村和苌庄乡等地，先后出土黑、褐釉高温窑变花瓷，被陶瓷学家称为&唐钧&，它是宋代钧瓷的先声。

It is well known that many cations will incorporate into the goethite structure, and therefore possibly into a precursor ferrihydrite.

广为人知的是许多阳离子将与针铁矿结构混合在一起，因此可能地在先驱者氢氧化铁之内。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。