基本解释气孔下生的同根派生 英汉例句Pits can be clearly seen in the walls of epidermal cells.Leaves are amphistomatic or hypostomatic. 水杉属的多数表皮细胞垂周壁明显弯曲,落羽杉属和杉木属有时微呈波状,其他属的表皮细胞垂周壁直。hypostomatic leaf 气孔下升叶