纤维束数、单束细胞数、纤维结节数已基本稳定，纤维细胞总数的增长有赖于纤维细胞的侵入生长。

The bands of fiber cells, the number of cells per bands, lodges of fiber cells get a stability, and the increase of the number of fiber cells dependents on the invasion of fiber cells.

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结果：孵育第18天，从泄殖腔附近发出的输尿管芽向生后肾组织侵入生长，生后肾组织产生许多生后肾小泡。

Results: At 18th day of incubation, ureteric bud from cloaca grew into metanephrogenic tissue which produced many metanephrogenic vesicles.

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相反，草类则生长得非常繁茂，到目前为止，它们已经从森林边缘侵入了长达200米的距离。

Grasses, by contrast, are doing well. So far, they have invaded as far as 200 metres from the edge of the forest.

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