During periods when commodity prices were high, the rate of westward migration increased spectacularly.
在商品价格较高的时期，西迁的速度大幅增长。
The QA environment can withstand generally longer periods of down time which makes it an appropriate environment to test your migration plan.
QA环境通常容许更长时间的停机，这使它成为测试您的迁移计划的适当环境。
It is pointed out that, the number, scale and migration direction of fans were controlled by palaeogeomorphology, periods and strength of fault movement, and the development of slope-bend belt.
古地貌形态、断裂活动期次、强度及坡折带的发育控制了扇体的数量、规模与迁移方向。
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