短語詞組短語drop -out of gear detail 失嚙temporary drop -out of voltage 電壓暫降drop out of step 失步drop out of existence 消滅drop out of gear 失嚙drop out of school 退學(xué);失學(xué);輟學(xué);休學(xué)drop out of hand 從手里落下 返回 drop out of