电子阅读器的流行使得纸质书变得过时了。
The popularity of e-readers has ___outmoded printed books.
这种老式手机现在已经过时了。
This old-style ___outmoded mobile phone is no longer popular.
智能手机的出现让传统翻盖手机逐渐过时。
The rise of smartphones has ___outmoded traditional flip phones.