孩子们喜欢在小溪的急流浅滩处寻找光滑的鹅卵石。
The children love searching for smooth stones in the ___riffle of the creek.
他随手翻阅着桌上的文件。
He ___riffled through the papers on the desk absentmindedly.
小溪在阳光下闪闪发光，欢快地流淌着。
The creek ___riffles cheerfully under the sunlight.
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