They'd reached one of the rustic bridges over an opaque emerald Isis tributary. TICKLED PINK (2002)`I believe that at one time this was a tributary of the Muddy River. THE SECRET OF THE FORGOTTEN CITY (2002)The camp was beside the grey shingle bed of a tributary stream. HIGH STAND (2002)
偶尔使用。在柯林斯辞典中， tributary 是3万个最常用词之一。
tributary 的定义—— 柯林斯 英语词典
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