柯林斯词典riverbed /ˈrɪvəbɛd/ (also river-bed) (riverbeds) 1. N-COUNT A riverbed is the ground which a river flows over. 河牀 返回 riverbed剑桥词典the ground over which a river usually flows 河牀 a stony /muddy /dry riverbed 多石的／泥濘的／乾涸的河牀 返回 riverbed