气温记录清楚无疑地证实了全球气候正在变暖。Temperature records have unequivocally confirmed the existence of global warming.许多人竟然不知道地球变暖的事实，实在令人担忧。Many people are worryingly ignorant of the facts about global warming.全球变暖是个严重的问题。Global warmin...
Valleys often take the form of deep canyons.山谷经常以深峡谷的形态存在。This mountain range has many high peaks and deep canyons.这条山脉有许多高峰和深谷.Do you use canyons or do we preserve them all?是使用峡谷呢还是全封闭保存?...