碾压处理区白根、黄根数量多，平均总根量大于对照区，说明碾压后土壤具有较好的保水保肥能力，有利于根系生长发育；

Roots developing and activity: The amount of white roots and yellow roots and the average gross roots are more in the pressed area compared to the traditional area.

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她穿着一条白连衣裙，系着一根蓝色的细腰带。

She wore a white dress with a thin blue sash.

《柯林斯英汉双解大词典》

我看到的不是一根白丝带，而是太多了。

I see not one white ribbon, but many.

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