VOA慢速英语2013.05.12
[audio]http://sound.yywz123.com/tingbbs/voa/voa20130512.mp3[/audio]He says a dense, competitive crop that quickly shades the soil will help suppress many weeds. The seeds need light to grow, so blocking the sun will reduce weed growth.他说,经过密植的具有竞争力的作物会很快遮蔽土地,这将有助于抑制杂草生长.杂草生长需要阳光,所以遮蔽阳光能够减少杂草生长.
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