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3.详细解说
1.“run a risk”表示“冒险，冒着危险，有危险”；“run a risk of doing sth.”表示“冒险做某事”。例如：Anyone travelling without a passport runs the risk of being arrested.（任何不带护照旅行的人都有被捕的危险。）另外，“take a/the risk (of doing sth.)”表示“决定冒险（做某事）”，例知：Isn't he taking a risk in coming here?（他来这里不是在冒险吗？）I couldn't take the risk of leaving him alone even for a short time.（我不能冒险留下他单独一个人，哪怕是一小会儿。）Many people are willing to take the risk in order to protect their families.（很多人为了保护自己的家人都愿意冒这个风险。）
2.“sulfur dioxide”的意思是“二氧化硫”。
