短語詞組短語concave spherical surface 凹球麪concave ellipsoidal surface 凹橢球麪concave rotative surface 凹廻轉(zhuǎn)麪concave cambered surface 移動擺桿annular concave spherical surface 凹球麪環(huán)狀concave aspheric surface 凹非球麪concave curve surface 凹曲麪Hoop concave spherical surface 倣形加工滾輪凹球麪concave -surface 水麪下凹 返回 concave surface