in previous years
... 他成为钢琴家在6年前 » He became a pianist in 6 years ago 往年 » In previous years 同级别产品价格便宜 » The same level of cheap ...
in former years
... [history;the past;past events] 从前的事情 [in former years] 往年 [(in) former days;in bygone days] 过去的日子;从前 ...
一般超过两年以上,才会被称呼成往年。