起源于...

The billhook was originally developed from a farming tool, and consists of an axe and hook on the end of a long pole.

钩镰最初起源于农具，其长柄顶端置有斧刃和利钩。

Life seems to be orignated from primitive ocean which covered the earth 4 billon years ago .

生命看来似乎起源于40亿年前覆盖着地球的原始海洋。

The life seemed that came from the original sea that covered the earth 4 billon years ago.

生命看来似乎起源于40亿年前覆盖着地球的原始海洋。

The wergeld, which only a generation ago was regarded as a specifically German institution, has now been shown to be general among hundreds of peoples as a milder form of the blood revenge originating out of the gentile organization.

这种赎金，在上一代还被认为是德意志人特有的制度，但现在已经证明，在成百个民族中都是这样，这是起源于氏族制度的血族复仇的一种普遍的较缓和的形式。

The Bloop sounds like it might have been created by an animal, but it is far louder than any whale song, so a marine creature that made it would either be bigger than any whale, or a much more efficient producer of sound.

这种杂音好像可能起源于某种动物，但是它的声音却远高于任何鲸鱼的吼声。因此，它要么它有一种是能比鲸鱼发出更高声音的海洋生物所引起，要么出之于一种效率更高的声音发生器。

"Bow-wow" theory: theory that language originated from people's imitations of animals cried and other sounds heard in nature .

"汪汪"理论，语言起源于人们模仿动物或能听到的大自然的声音。

Secondly, according to the stem and leaf anatomy, leaf epidermis, pollen morphology and floral development, it is found that there are no close relations between Acorus and Typhales, especially in the aspect of floral development. In the course of floral development of A. calamus, neither bracteloe primordium nor common primordium occurs in the whole course. Early development of the flower is strongly unidirectional. Three shield carpels develop into a pistil. In Sparganium fallax, each female flower has a bracteole. The bracteole primordium and the floral primordium originate from a complex structure. A single saccate carpel develops into a pistil. In staminate flowers, petal and stamen primordia initiate spirally.

菖蒲属与香蒲目的茎叶解剖特征、叶表皮特征、花粉特征及花器官发生特点等亦存在着明显区别，特别是花器官发生特点差异尤为显著，如菖蒲属花器官发生过程中，没有苞片原基，也不存在任何形式的复合原基，花被与雄蕊原基均以单向性方式发生，雌蕊由3心皮发育而成，具有"盾状心皮"的特点等，黑三棱属则有苞片原基发生，且苞片原基与雌花原基起源于共同的复合结构，雄花的花被原基和雄蕊原基均以螺旋状方式发生，雌蕊由单心皮发育而成，未发现有2或3个心皮原基或其痕迹的现象，体现出"囊状心皮"的特点。

Usually originated in the larger bronchi, mostly of central type lung cancer.

一般起源于较大支气管，大多为中央型肺癌。

The spat began when Mears, who founded a bushcraft school 25 years ago, laughed out loud in a Radio Times interview after being asked if he watched his rival's programmes to pick up survival tips.

他们之间的争执起源于雷胖子在一次电台节目采访中被问到他时候通过观看他的对手的节目学到一些个生存技巧时的哈哈大笑，雷胖子在25年前建立了丛林求生学校。

According to the dendrogram by UPGMA cluster analysis using Neis(1972) distance calculations based on AFLP banding, all the accessions were distinct and revealed enough genetic diversity for identification and classification of accessions within Cajanus cajan. From ME cluster analysis, 9 distinct evolutionary groups were detected. The preliminary results indicated that China maybe one of the pigeonpea genetic diversity minor center.

根据AFLP多态性数据绘制的聚类图，将139份木豆资源分为9个类群，并在分子水平上初步探讨了它们之间可能存在的演化关系，支持了木豆起源于印度，并在非洲东部形成次生起源中心的观点，并提出中国可能是栽培木豆的又一次生起源中心。

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。