The pipes can be divided into four kinds based on their cause of formation, namely pipes formed by the animals, by the roots of plants, by the cracks of soil and by the soil water movement.

根据土管成因不同将其分为四种类型，即土壤动物活动导致的土管、植物根系形成的土管、土壤裂隙形成的土管和土壤水分运动形成的土管。

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According to related documents back to its roots, the sources of Wei's theory in sports are found mainly due to four factors: times, culture, family and personality.

通过查阅相关文献资料追溯其根源，魏源体育思想的成因主要源于时代、文化、家庭、个性四个因素。

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N fertilization in both plantations significant decreased the biomass of the first five order roots by the method of soil cores in four sampling seasons and two soil depths.

施杀虫剂处理导致两林分四个季节、两个土层中细根生物量显著增加，但是，两树种仅前两级根的生物量显著增加。

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It is the job of the people in this war room to water and nurture the grass roots which sprang up so naturally four years ago.

BBC: A targeted message from Obama 2012

Four of his smaller coalition partners have Islamic roots.

ECONOMIST: Banyan

"This will boost productivity, but it will also change the mind-set of France's workforce, " explains Philippe Favre, chief executive of Invest in France Agency, which has offices on four continents and assists companies seeking to drive roots into France.

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