英语语法分析

Windbreaks have covered across all provinces of China.

防风林覆盖了中国所有省份。

Since 1978, over 66 billion trees have been planted to act as windbreaks.

自1978年以来，已经种植了660多亿棵树，作为防风屏障。

It has helped to plant more than 66 billion trees across 13 provinces in the country's north to act as windbreaks (防风林) , according to China Daily.

《中国日报》称，它在该国北部的13个省种植了660多亿棵树作为防风林。