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1·In winter, the ground would be carpeted with a thick layer of snow.

冬天，地面上铺满了一层厚厚的雪。

2·They spring up quickly after rains, when the surface is moist. Then, for a brief time, the desert can be literally carpeted with color.

当雨后地表还潮湿时它们就迅速发芽，然后在一个短时间里，给沙漠铺上绿色地毯。

3·Then, for a brief time, the desert can be literally carpeted with color.

当雨后地表还潮湿时它们就迅速发芽，然后在一个短时间里，给沙漠铺上绿色地毯。