它们还分泌蜡质的透明物质，称作角质。
They also secrete a waxy, transparent substance called cutin.
粉质胚乳型玉米鲁单50对贮藏物质的分解利用效率高于角质型胚乳玉米农大108。
Farinaceous endosperm breed LD50 'efficiency of decomposition and utilization of storage substance is higher than keratin endosperm breed ND108.
指甲指甲由称为角质的硬脆物质组成。
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