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1·The actuality of degenerated nature grassland in northern agro-grassing acetone along the line of the great wall was described in this paper.

描述了长城沿线农牧交错区天然草场退化现状，指出退化主要原因是干旱少雨、超载放牧、滥垦和不合理利用土地、滥采乱挖。

2·Viticulture : Environment respecting approach to limit the use of chemical products; grassing down to minimize the use of herbicides; partly mechanical and partly manual harvest.

种植方式： 合理种植以减少化学药品的使用。留草以减少除草剂使用。采收部分机械部分手工。

(1)on the grass在草地上

(1)green grass绿色草，青草

(1)forage grass饲草

(1)grass carp草鱼，鲩鱼

(1)grass land草地；草滩

(1)keep off the grass不践踏草地；小心