大约是十年前或八、九年前，我们这里市政府颁布了一项法规，说是严禁在市区燃烧落叶，因为燃烧所产生的烟尘含种种有毒和致癌物质，污染空气，影响市容，损害市民健康，等等。对这么好的法规，我理应举双手拥护；但只是“理应”而已，事实上我并没举双手拥护。为什么呢？因为 About ten years ago or eight or nine years ago, the municipal government here promulgated a statute that says it is forbidden to burn fallen leaves in the urban area because the smoke and fumes produced by the combustion contain various toxic and carcinogenic substances that pollute the air and affect the appearance of the city. Damaging public health, and so on. I should give my best support to such a good law and order. However, I should just “reason” it. In fact, I did not give my support. why? because