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The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated to be distinctively either plant or animal, while, as respects ordinary plants and animals, the difficulty of laying down a definition has become far greater than ever before.

现在最好的意见是，有许多形态没有足够的区别来区分植物或动物，而就普通的植物和动物而言，给它们下一个定义比以往任何时候都困难得多。

— Asa Gray ASA灰色