答：這個damaging和interesting壹樣，是形容詞，只不過碰巧與現在分詞同形罷了。
麥克米蘭英語詞典 - American
damaging
dam·ag·ing / `d?m?d / adjective *
1 causing physical harm to something so that it is broken, spoiled, or injured:
Increased emissions almost certainly have a damaging effect on the environment.
damaging to: Smoking is damaging to your health.
2 having a negative effect on someone or something:
Hurst resigned after a series of damaging allegations concerning his personal life.
damaging for: The new tax laws could be very damaging for small businesses.
damaging to: These revelations are potentially damaging to the Democratic Party.