don'tletthelastdropofwaterontheearthbecomesourlasttear，是什么意

don't let the last drop of water on the earth becomes our last tear，不要让地球上的最后一滴水变成我们最后的眼泪，don't let the last drop of water on the earth becomes our last tear，不要让地球上的最后一滴水变成我们最后的眼泪，