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The theory, operation detail, software tool of PM have meet the quite mature phase through the many years development and perfect in various fields, and we can say the PM is the edge tool of completing the engineer, studying and development perfectly, and so on.

项目管理的知识起源于美国 40 年代，经过多年在各个领域的不断发展和完善，其理论知识、操作细节、软件工具已达到相当成熟的阶段，可以说项目管理是更好地完成工程、研发等各个领域工作的利器。

The knowledge of PM comes of the America in 40~. The theory, operation detail, software tool of PM have meet the quite mature phase through the many years development and perfect in various fields, and we can say the PM is the edge tool of completing the engineer, studying and development perfectly, and so on.

项目管理的知识起源于美国40年代，经过多年在各个领域的不断发展和完善，其理论知识、操作细节、软件工具已达到相当成熟的阶段，可以说项目管理是更好地完成工程、研发等各个领域工作的利器。

What a shame that most people treat this casually and do not examine themselves until a calamity happens. Even then, they may still be muddled and not realize that the calamity came from their own tongue-wagging!

可惜人总是等闲视之，总要等到惹出祸事，否则还不知检讨或反悔；甚至有的还懵懵懂懂地，不知祸事正是起源于自己的多嘴饶舌呢！

The event has its origins in the Temperance Movement during the early 1880s and coincides with the annual race week at High Gosforth Park.

这一活动起源于1880年代早期的禁酒运动，并且恰好与戈斯福斯万豪酒店的年度接力周同时进行。

It is advanced farming technology which through the implementation of reduced tillage, no-tillage technology, using crop stalks stubble ground cover to reduce soil water erosion, wind erosion, so as to enhance the capacity of soil fertility and drought-resistance .Function and role of conservation tillage technology have been proved by practice.

保护性耕作技术是相对于传统耕作的一种新型耕作技术，起源于19世纪末的美国，通过对农田实行少耕、免耕技术，尽可能用农作物秸秆、残茬覆盖地表，以减少土壤水蚀、风蚀，从而提高土壤肥力和抗旱能力的先进耕作技术。

Neural stem cells have a strong self-renew mechanism and it can transform after a little break. Neural stem cells have a long term survival, which mean that it has more probability of wrong copy than mature cells. These cells are formed glioma stem cells in the end. The genes who adjust neural stem cells can express in glioma stem cells, which hold out glioma stem cells from neural stem cells. There is another presume that glioma stem cells come from differentiated cells. Through the gene break of these cells, they can obtain characteristics of stem cells, then form glioma stem cells.

神经干细胞具有很强的自我更新机制，获得较少突变即有可能恶性转化，而且干细胞存活时间较长，这意味着干细胞比成熟细胞发生细胞复制的错误几率更大，因外界环境的刺激而发生突变的机会更多，最终形成脑胶质瘤干细胞，同时调节神经干细胞增殖和自我更新的基因在脑胶质瘤的脑胶质瘤干细胞中也表达，这也是支持神经干细胞是脑胶质瘤干细胞来源的；也有推测认为它可能起源于已分化的细胞，由这些细胞突变发生去分化得来，并通过基因突变而获得了干细胞自我更新的特性，从而形成脑胶质瘤干细胞。

Platyrhynchos and spot-billed ducks taken from GenBank, a total of 30 haplotypes were used in the phylogenetic analysis, and the results showed that the four domestic duck breeds originated from A. platyrhynchos.

platyrhynchos和斑嘴鸭序列，共有30种单倍型，共同构建系统发生树和网络关系图，结果表明4个家鸭品种单一地起源于绿头鸭。

Where does the snail and slug kingdoms originate?

蜗牛和蛞蝓起源于什么地方？

" One generalization that can be made is that the Chinese carps, particularly grass carp and silver carp, are more delicate animals than related species of European or Central asian origin."

一般可以这样看：中国鲤科鱼类，特别是草鱼和鲢鱼，比之起源于欧洲和中亚的有关鱼种，其肉质更为细嫩

" One generalization that can be made is that the Chinese carp s, particularly grass carp and silver carp , are more delicate animals than related species of European or Central asian origin."

一般可以这样看：中国鲤科鱼类，特别是草鱼和鲢鱼，比之起源于欧洲和中亚的有关鱼种，其肉质更为细嫩

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。