是Don't cutting down trees. 还是Don't cut down trees. ?

是Don't cutting down trees. 还是Don't cut down trees. ? if people don't stop cutting down trees,perhaps there will be no forests in twenty years' time（保持句意不变） if people don't stop cutting down trees,perhaps there will______be no forests in twenty years' time cutting down的意思是?用法? We should stop cutting down trees if we don't want a world without trees=?We should stop cutting down trees if we don't want a world without trees=We should stop cutting down trees if we want a world____ ____trees空里填 keep cutting down 英语翻译Cutting it close,don't you think? Don't let me down “Don't talk me down” how cutting down trees hurts Don't push me,don't tie me down Dont look down let you 是什么意思? You don't let me down是什么意思? Only don't let me down Don'T Bring Me Down 歌词 Don't look down on a person up and down don't let me 1.please standup.don`t( )down,please. Don't let me down.别让我失望.down是向下也没有失望的意思啊