since ten years since ten years ago区别

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since ten years since ten years ago区别

你貌似写错了吧,应该是for ten years
因为since是加时间点,不可能加时间段的,是for加时间段
for ten years=since ten years ago,且都用于现在完成进行时
举个例子就是:
I have been collecting kites (for ten years)或(since ten years ago)