为防止水涝，我们必须使河水改道。
To prevent flooding, we shall have to divert the river from its course.
后来因为河水改道，才逐渐衰落下来。
建坝时，他们让河水改道。
原本密西西比河冲刷三角洲一端松土的同时另一端沉积着，现在因为要预防洪水被改道了，因此会有陆地被河水冲走。
The Mississippi River, which used to sweep up dirt in one stretch of the delta only to deposit it in another, has now been channelled, for flood-prevention, to wash the land into the sea.
公元4 ~7世纪间，古城上游河段曾先后两次发生河岸滑坡堵塞河水，形成堰塞湖，导致孔雀河改道，从而彻底断绝了维系楼兰古城生命的唯一水源，古城不得不被废弃而且无法复兴。
In the 4 ~ 7 century, the water resources from Kongqiu river was cut off because of old Kongqiu river changed channel resulted from landslip on upper reaches. The old city had to discard.
公元4 ~7世纪间，古城上游河段曾先后两次发生河岸滑坡堵塞河水，形成堰塞湖，导致孔雀河改道，从而彻底断绝了维系楼兰古城生命的唯一水源，古城不得不被废弃而且无法复兴。
In the 4 ~ 7 century, the water resources from Kongqiu river was cut off because of old Kongqiu river changed channel resulted from landslip on upper reaches. The old city had to discard.
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