We used to be very good friends.
我们过去曾是很要好的朋友。
I want to be used on SEO is a very good portraiture.
我想用在SEO上就是一个很好的写照。
If they can be recovered and used to have very good economic and social benefits.
如果能加以回收和利用，就具有很好经济效益和社会效益。
He used to be a very good athlete.
他曾是个非常优秀的运动员。
He used to be a very good athlete.
他曾是个非常优秀的运动员。
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