单词 drop-off 例句 DEFINITIVE EXAMPLES 权威例句〔drop-off〕The drop-off along the trail is very steep.崎岖小路上的这个下坡很陡。韦氏高阶〔drop-off〕There has been a drop-off in attendance this year.今年的出席人数大幅减少。韦氏高阶〔drop-off〕This area is...