往返迁移
往返迁移-
强震活动的空间分布表现为有规律的纬向往返迁移；
The spatial distribution of the strong earthquake activity shows that the epicenters migrate in latitude direction with regularity .
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提出雌藏羚的迁移是以昆仑山为中心，分布在昆仑山南面的雌藏羚夏季至秋初在北方产仔，其它季节在南方交配栖息，因此两地间存在往返迁移。
The female , chiru distributed in southern Kunlun Mountains bore the young in north from summer to early autumn , and copulated and inhabited in south in other seasons . Thus there were two migrations between two sites .