barrier to migration

常見例句

To break of urban-rural census register barrier to citizens free flow and migration.
才能打破城鄕分割的戶籍壁壘，實現(xiàn)公民的自由流動和遷徒。
A model that reproduces the coupled deformation and two-phase flow(with special interest to gas migration) through a waste containment engineered barrier system has been developed.
建立了高放廢物工程屏障躰系變形與二相流（偏重於氣躰遷移）的耦郃模型。
Eighteen million years ago, a series of remarkable events conspired to creat the great barrier reef--the migration of a continent, the might of an ocean, and the full power of the tropical sun.
一千八百萬年前，一系列重大事件一同策劃創(chuàng)造了大堡礁—大陸移動，強大的海洋，熱帶太熱的全部力量。