coarse-grained 是什么意思

	adj. 1.粗粒的；木理粗糙的。 2.粗鲁不文的。

	not having a fine texture; "coarse-grained wood"; "large-grained sand" 同义词：large-grained,
	composed of or covered with particles resembling meal in texture or consistency; "granular sugar"; "the photographs were grainy and indistinct"; "it left a mealy residue" 同义词：farinaceous, grainy, granular, granulose, gritty, mealy,

The only local coarse-grained sand-stones in the uppermost part are important for uranium .
仅最上面局部的粗粒砂岩对铀是有利的。

coarse-grained是什么意思