They have special cause of formation. In connection with the necessary processes of movement of natural persons, many countries set up four principal barriers.
各国在自然人流动所必经的各阶段对其层层设卡，从而形成了四大类型的自然人流动壁垒。
The survival of a genre of dance depends on its comparatively comprehensive dance pattern, historical cause of its formation in special ecological environment and unique aesthetic features.
一个舞种是否成立，是要看它是否具备相对完备的舞蹈形态，有着怎样的独特生态环境中的历史成因，以及有没有形成独具一格的审美特征。
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