River-delta
河流三角洲
?? 詞語組成解析
river
['riv?]
n. 河，江;溪，巨流;
delta
['delt?]
n. 希臘語字母表第四字母δ;（河流的）三角洲;[數]變量增量;
??? 情景例句
Dad was a busy doctor,
爸爸是個很忙的醫生，
His idea is childish.
他的想法很幼稚。
Hello! Could I speak to the headmaster, please?
您好！我能和校長通話嗎？