不育叶 meaning in Chinese

sterile frond

Leaves tufted ; stipes 15 - 30 cm long , densely scaly at base , glabrous above ; sterile lamina about 60 cm long and 20 cm wide , simply pinnate ; pinnae numerous , alternate or subopposite , linear - lanceolate , the largest about 12 cm long and 1 cm wide , base cordate , apex acuminate , margin finely toothed ; veins close , forking once or twice and forming areoles near the midrib ; fertile lamina similar to sterile ones , but somewhat reduced , about 8 cm long and 0 . 4 cm wide , lower surface almost entirely covered with sporangia
叶簇生；叶柄长15 - 30厘米，基部密被鳞片，向上近光滑；不育叶片长约60厘米，宽20厘米，一回羽状；羽片多数，互生或近对生，线状披针形，最长者长达12厘米，宽约1厘米，顶端长渐尖，基部心形，边缘有细密锯齿；叶脉1 - 2次分叉，近中脉形成网眼；能育叶与不育叶相似，但较小，长约8厘米，宽约0 . 4厘米，下部满布孢子囊。