The contracting parties shall conduct cooperation to crack down on illegal immigration, including the crack down on illegal transportation of natural persons via its territory.
缔约双方将合作打击非法移民，包括打击通过本国领土非法运送自然人的行为。
2
In the stage of field population study, most study focus on the congregation and immigration of insect population, the investigation of natural population quantity.
在田间种群研究阶段，主要进行种群聚集与扩散迁移的研究和自然种群的数量调查。
3
It makes natural person benefiting from the movement, at the same time, it also brings economic benefits and talent advantages to countries. Compared with the immigration system, it more flexible.