He studied Chinese for quite a few years.
他学汉语已有好几年了。
According to my knowledge, we have been working on this for quite a few years.
据我所知，这个条约已经谈了好几年。
He is experienced businessman who has engaged in foreign trade for quite a few years.
他是个有经验的商人，做国际贸易已有好几年了。
He is experienced businessman who has engaged in foreign trade for quite a few years.
他是个有经验的商人，做国际贸易已有好几十年了。
He is experienced businessman who has engaged in foreign trade for quite a few years.
他是个有经验的商人，做国际贸易已有好几十年了。
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