1.开篇表达

Obviously we can say there are quite a lot of dangers with regard to

this issue.

It's universally accepted that there are a few hazards involved with international tourism .

This issue is weighed down by a few problems.

2强调较主要的问题

At the outset,the most crucial predicament is that visitors spoil the beauty of nature by creating

and leaving behind so much trash.

First and foremost,one major worry is probably that the number of vehicles is increasing much more rapidly than the building of roads.

Essentially,one fundamental concern is probable that as China prospers and more and more people buy cars,there are simply not enough mechanics and garages for car repairs.

3展开论述第一个问题时

This is clearly alarming because we are facing great environmental

problems today.

This fact is unmistakably perturbing because traffic is becoming more

and more a serious problem nowadays.

This needs to be seen as a sensitive matter because the state of the

environment is a global concern.

4.提出第二个问题

Additionally,another major cause for concern has to be the fact that

conducted tours greatly restrict the exposure of tourists to local culture.

Equally worrying is the suggestion that there seem to be too many

private cars and not enough buses.

Another matter which causes unease is the point that the gap between

the rich and the poor increases social insecurity.