平周壁 meaning in Chinese

periclinal wall

Both upper and lower epidermis cells are polygonal or irregular in shape in all species studied . the patterns of anticlinal walls are straight , arched or sinuous , and the raphal cuticular striastriae are occasionally observed on periclinal walls . stomatal apparatus and secretory cells are found on the upper epidermis of several species and on the lower epidermis of all species
结果表明：这些植物叶片的上、下表皮细胞呈多边形或不规则形，垂周壁式样为平直、弓形或波浪状，平周壁偶有脊状条纹；少数种类上表皮还有气孔器或分泌细胞，所有种类下表皮具气孔器和分泌细胞；气孔器类型以平列型和侧列型居多，偶尔有无规则型；气孔极区呈稍角质加厚或棒状加厚，稀t形加厚。