因为世界各地都有蕨类植物，所以这种方法有很大的发展空间。

Because bracken occurs throughout the world, there is plenty of scope for this approach.

youdao

因为世界各地都有蕨类植物，所以这种方法有很大的发展空间。

Because bracken occurs throughout the world, there is plenty of scope for this approach.

youdao