久久国产欧美日韩精品,日韩国产精品久久久久久亚洲,99视频精品全部免费免费,91精品国产综合久久走光

gravelstone的音標(biāo)：gravelstone的英式發(fā)音音標(biāo)為：[ɡ'r?vlst??n]gravelstone的美式發(fā)音音標(biāo)為：[ɡ'r?vlsto?n]...

n.小石...

Suetion devices are inadequate in gravels or very porous soils.吸水裝置對(duì)砂礫或非常疏松的土壤是不適用的.They may form concentrated pockets in gravels.它們可能在礫石堆積物中形成富集的礦囊.Graves are a mix of gravels, clay and sand carried out by the river.它混合...

gravels的音標(biāo)：...

n.沙礫( gravel的名詞復(fù)數(shù) )，礫石，石子，結(jié)石...