are 去掉
原因：此处benefit为不及物动词 vi.
意为：得益,受惠
后接by/from 即 benefit from/by 从……中得益；得益于……
* We benefited greatly by this frank talk.
这次坦率的谈话使我们获益匪浅.
* He will benefit from/by the new way of doing business.
他会从新的做生意方法中受益.
* We can all benefit from/by our knowledge.
我们都可从我们的只是种获益.
* You can benefit from/by what he told you in the letter.
你可以从他在信中告诉你的话中受益.
* I benefited from my father’s advice.
我得益于父亲的忠告.