词汇	down direction
释义	down direction 下行方向
随便看	essential reason essential reasoning essential reasons essential record Essential Record of Tea Tasting essential regulation essential relation essential relations essential renal bleeding essential renal hematuria essential repair parts stockage list essential repair stock list essential reproductive health services essential requirement essential requirements essential resistance essential right ideal essential rights essential root essential rule essentials essentialsafety essential safety essential safety source essentials and sufficiency