问题描述：
英语翻译
U.S.health officials are expressing cautious optimism the virus causing swine flu A-H1N1 may not be as virulent as initially feared,but they say aggressive steps to combat the infectious disease are still warranted.
怎么翻译的流畅点,意思我懂,就是不知道怎么翻译的自然点
U.S.health officials are expressing cautious optimism the virus causing swine flu A-H1N1 may not be as virulent as initially feared,but they say aggressive steps to combat the infectious disease are still warranted.
怎么翻译的流畅点,意思我懂,就是不知道怎么翻译的自然点
问题解答：
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