英语翻译In 1620，about half the USA was covered by forests.Today

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英语翻译
In 1620，about half the USA was covered by forests.Today the forests have almost gone.A lot of good land has gone with them，leaving only sand.
China doesn't want to copy the USA's example.We're planting more and more trees.We've built the " Great Green Wall" of trees across northern part of our country.
The Great Green Wall is 000 kilometres long，and between 400 and 700 kilometres wide.It will stop the wind from blowing the earth away.It will stop the sand from moving towards the rich farmland in the south.More "Great Green Walls" are needed.Trees must be grown all over the world.Great Green Walls will make the world better.
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1620年,美国接近一半的土地被森林所覆盖.如今,森林几乎都消失了,大部分良田也随之东去,只剩下沙漠.中国不愿重蹈覆辙.所以我们种植越来越多的树.我们修筑成了横跨国土北方的“绿色长城”.绿色长城,长7000千米,宽400至1700千米.长城的修建,有助于阻止土壤被狂风吹走.同时,也能够有效阻止南部富饶的土地继续沙化.我们需要更多的“绿色长城”.绿树应在全世界范围内种植.绿色长城将使世界变的更加美好.

英语翻译In 1620，about half the USA was covered by forests.Today 英语翻译In 1620,about half the USA was covered by forests． Today In 1620,about half the USA was covered by forests.此句子对吗? In 1620,about half the U.S.A.was covered by forests. the Great Wall in Chian will be covered by forests ( ). In 1850,about a third of U.S.A___(be) covered by forests. The Great Green Wall in China will be covered by forests ( ）英语翻译What has happened to the forests of the USA in the last △In1850,about a third of U.S.A.( )covered by forests.A.were In 1620,about half of the USA___covered by forest A:are B:is In 1620,about half the USA__forest. We covered the distance in half an hour 为什么用covered