英语语法分析

They flung themselves down on the sward [turf], close to their underground home.

他们扑倒在草地上，离他们的地下住宅很近。

Light grazing or over grazing lead to deteriorative succession of artificial sward.

轻度放牧或过度放牧都可以引起人工草地的退化演替。

The effect of 6 grazing intensities on growth of yak and the secondary productivity of sward was studied.

试验研究了6种放牧强度对牦牛生长及草地第二性生产力的影响。