#自然科学篇：The new way of getting fresh water 搜索结果
Haveyoueverseenthenewwayofgettingfreshwater?Hereisanexample.First，peoplemakesomelongponds(池塘)whichareabouthalfameterdeep.Thentheyputacover(盖子)overeachpond.Thecoverismadeofglassthatyoucanseethrough.A
02-10