当然是在激流水道中，要求运动员通过20 ~ 30个水门。
On a whitewater course, of course. Competitors are required to pass 20 to 30 gates.
像河流和小溪那样的流水称为激流生态系统；像湖泊和池塘的死水称为静水生态系统。
Flowing waters like rivers and streams are called lotic ecosystems; standing water like lakes and ponds are lentic.
流水也同样形成了峡谷中滔滔的激流。
All that flowing water has also created the canyon's white knuckle rapids.
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