短語詞組短語dropping out in college 高校退學(xué)dropping end in outside layer 外層落緒dropping object in the well 井內(nèi)落物dropping in angel 落入角dropping in hill 穴播Dropping in Sahara 撒哈拉的水聲Thanks for dropping in 謝謝你來看我Invitation and dropping in 邀請(qǐng)和拜訪dropping in stable water 靜水沉降 返回 drop in