叶护，古时突厥、回纥等民族的官名。地位仅次于可汗。世袭，由可汗的子弟或宗族中的强者担任。
你可以用树皮，松针，棉籽叶或橡树叶做的根护物。
You can use mulch made from bark, pine needles, cottonseed or oak leaves.
护田作物；遮盖作物一种用同其它作物一起播种的作物，用来保护其它作物。例如三叶草有时和一些小粮食作物一起播种。
Cover crop; nurse crop a companion crop grown to protect some other crop sown with it as small grain is sometimes seeded with clover.
而水稻小穗中护颖的性质究竟是叶的突变形式还是退化的小花也一直没有定论。
Whether the empty glume of rice spikelete came from leaf or rudimentary spikelete still remains less understood.
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