It is disturbing to think that a dangerous wild animal is still at large in the quiet countryside.
为什么不是disturbed?
We should say:
Something is disturbing.
Somebody is disturbed.
Something is disturbing. It refers the infinitive to think that a dangerous wild animal is still at large in the quiet countryside . The infinitive means something.
Because something disturbs somebody, somebody is disturbed.
Do you understand?
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