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。
Why 143 The reason why we have to grow trees is that they can supply fresh air for us.
我们种树的原因是他们能供应我们新鲜的空气。
The reason why we have to grow trees is that they can provide us with fresh air. 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。 我们必须种树的原因是它们能供应我们新鲜的空气。
The reason why we have to grow trees is that they can provide us with fresh air./ 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。
The reason why we have to grow trees is that they can provide us with fresh air (supply fresh air for us).
我们不得不种树的原因是他们可以给我们提供新鲜空气(为我们提供新鲜空气)。
The reason why we have to grow trees is that they can provide us with fresh air (supply fresh air for us).
我们不得不种树的原因是他们可以给我们提供新鲜空气(为我们提供新鲜空气)。
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