DICT.TW Dictionary Taiwan

 rapids
 急湍

 Rap·id, Rap·ids , n.  The part of a river where the current moves with great swiftness, but without actual waterfall or cascade; sometimes called whitewater; -- usually used in the plural; as, the Lachine rapids in the St. Lawrence.  For boaters on the river, it is a place that can be hazardous, with danger of capsizing or crashing into large rocks.
 Row, brothers, row, the stream runs fast,
 The rapids are near, and the daylight's past.   --Moore.
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