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The industrial synthesis of 1, 4-butanediol from allyl alcohol involves two steps with low yield and selectivity.

目前工业上都是采用两步法由丙烯醇生产1，4-丁二醇，效率低，选择性差。

The most common type of alopecia areata involves hair loss in one or more round spots on the scalp.

最常见的斑秃脱发涉及的一个或多个景点一轮的头皮上。

A numerical simulation technique based on the stable alternating direction implicit method and the upper bound element technique is presented and applied to simulations of extrusion directly following liquid infiltration which involves infiltration,solidification, and large plastic deformation in one process.

采用稳定的交替方向隐式有限差分方法、上限元法等数值计算方法模拟了融浸渗、凝固和大塑性变形为一体的液态浸渗后直接挤压的工艺过程。

The trial involves adults and children who have a condition called Leber's congenital amaurosis, which is a type of inherited retinal degeneration.

该项试验涉及患有莱伯氏先天性黑蒙的儿童和成人。

Long-term since, macroeconomics involves an amenorrhoea help only, the research below open economy condition often is ignored.

长期以来，宏观经济学只涉及封闭经济，开放经济条件下的研究往往被忽视。

The linear system optimum control theory distributes one of parameter systembasic topics,in domains and so on aerospace,national defense,finance,communicationhas the widespread application prospect.simultaneously, because the research tech-nique involves to foundation mathematics theories and so on the functional analysis,analysis situs,geometry, algebra.

线性系统的最优控制理论是分布参数系统的基本课题之一，在航空航天、国防、金融、通讯等领域有着广泛的应用前景。同时，由于研究手法涉及到泛函分析、拓扑学、几何学、代数学等基础数学理论。

The primary purpose of analytical chemistry involves finding out the amount and types of chemical species present in a system.

分析化学的主要目的是发现存在于系统中化学核素的数量和类型。

Management consulting involves the identification and cross analyzation of the best business practices, analytical methodologies, change management, technological adaptations, strategy development and many more.

管理咨询涉及查明和跨因素的最佳商业做法，分析方法，变更管理，技术调整，战略发展等等。

This method involves analysis of the phase shift of the temperature wave, which is propagated through the specimen as a function of the square root of the angular frequency of the temperature wave.

中文翻译：温度波分析法涉及分析相移温度波，这是通过标本宣传作为一个功能的温度波的平方根角频率的函数。

It involves sitting back and making annoyingly knowing remarks at every stage.

这种方法就是作壁上观，在各个阶段都发出一些令人厌烦，却又颇有见地的声音。

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。