起源于

They were thus contemporary with modern Homo sapiens, who originated in Africa about 200,000 years ago.

他们与近代的智人同类，现代智人在200，000年前起源于非洲。

The principle of the hot-wire air flow sensor is introduced here,the design for measurement circuit at constant current and constant temperature are expounded,the flow equations have been derived out.

热线式空气流量计是测量空气流量的一种重要工具，它起源于20世纪初，一直广泛用于流体速度测量，并且在20世纪60年代以后曾一度是流体测速领域中的主要技术之一。

The classic example is the ear ossicles of mammals, which we know from palaeontological and embryological studies originated in the upper and lower jaws and the hyoid of their Synapsid ancestors, and further back still were part of the gill arches of early fish.

典型的例子是哺乳动物的听小骨。我们从古生物学和胚胎学研究了解到，哺乳动物的听小骨起源于它们单弓型祖先的上下颌骨和舌骨，再往前则是早期鱼的鳃弓的一部分。

Others hypothesize that both works were derived from a common source.

其它假定两者的作品起源于一个通常的来源。

Ice hockey began in canada, but we do not know exactly how it began.

冰球起源于加拿大，但我们并不确切知道它是如何开始的。

Ice Hockey began in Canada. But we do not know exactly how it began.

冰球起源于加拿大，但是我们无法准确知道它是如何发起的。

The Amazon is now said to begin in an ice-covered mountain in southern Peru called Mismi.

如今我们被告知亚马逊起源于秘鲁南部的冰雪覆盖的山上

In contrast, the two rock associations at the south belts were derived from mesomatised lithospheric mantle. However, the ultramfic-alkaline rock association was resulted from immiscibility of parent magma, whereas sodic alkaline rocks were produced by highly differentiation at deep level.

南部的两种岩石组合类型均起源于岩石圈地幔，并在部分熔融之前发生过交代富集作用，但是超镁铁质岩-碱性岩组合为原始岩浆经不混熔作用形成，而钠质碱性岩是原始岩浆在深部经历了高度分离结晶的产物。

It originated in the United States impromptu street dance movements of the dancers.

它起源于美国街头的舞者的即兴舞蹈动作。

It originated in the United States street dancers and improvisational dance movements.

它起源于美国街头舞者的即兴舞蹈动作。

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。