The grey leaf—spot is one of the essential diseases of poplar.
灰斑病是杨树的主要病害。
In different groups the grey leaf type is precocity, the yellow leaf type is late.
灰叶羊草为早熟型，黄叶羊草为晚熟型。
In 1981—1987, the damage to rice of the third generation rice leaf-tier Parnara guttata Bremer et Grey larvae was studied.
作者于1981—1987年对直纹稻弄蝶第三代幼虫为害损失进行了研究。
She seemed to have powdered her face again and the lamplight gave it a grey-green tinge, rather like a black withered leaf covered with frost.
她的脸上大概又擦了粉，被灯光照得显出点灰绿色，像黑枯了的树叶上挂着层霜。
The upper leaf is green-grey in color on top, while the underside is a whitish color.
叶子的上部顶处是灰绿色，下部是发白的颜色。
The upper leaf is green-grey in color on top, while the underside is a whitish color.
叶子的上部顶处是灰绿色，下部是发白的颜色。
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