How important it is to protect our environment!
How +形容词+主语+系动词be, 表达感叹.
或者
What an important thing it is to protect our environment!
What +a/an +名词+主谓语,也表达感叹.
英语翻译翻译一个句子：“保护我们的环境是那么的重要!”用how开头,最好说明为什么这样翻译,用到的语法等等,
How important it is to protect our environment!
How +形容词+主语+系动词be, 表达感叹.
或者
What an important thing it is to protect our environment!
What +a/an +名词+主谓语,也表达感叹.