发布时间：2016-03-03 来源：新东方在线 发布人：zolo
As is subtly portrayed in the cartoon, two tourists are taking sightseeing on a small boat while discarding their picnic leftovers casually into a lake. And below the drawing, there is a topic which says: "after" the travel.
From the portrayal, we can conclude that the painter wants to convey such a message: a good many scenic spots are flooded with visitors, who spoil the beauty of nature by creating and leaving behind God-knows-how-much trash. On the one hand, some people, arguing that tourism serves as an engine of economic growth, seem to ignore its negative effects on the environment. On the other hand, tourism has exerted great pressure on the environment we are living in: water is polluted, the ecological system is disturbed, and natural resources have been excessively used.
Briefly speaking, it is high time that we enhanced people's awareness to rectify this by taking the environmental protection into consideration.