the reason why we have to grow trees is that they can supply fresh air for us
我们必须种树的原因是它们能供应我们新鲜的空气
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The reason why we have to grow trees is that they can supply fresh air for us!
我们必须种树的原因是他们能提供给我们新鲜的空气！
The reason why we have to grow trees is that they can supply fresh air for us.
我们有必要种树的要素是它们能供给我们新鲜的空气。 。
The reason why we have to grow trees is that they can supply fresh air for us.
我们必须种树的原因是它们能为我们提供新鲜的空气。
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