Deyang has been sorting its rubbish into the same four groups since several years ago.

德阳从几年前就开始将垃圾分成同样的四类。

youdao

I first encountered DFA several years ago when I worked on regular expressions, but it has been at least three years since I last used them so I spent some time researching the subject.

几年前，我在处理正则表达式时，第一次遇到了DFA，但是我已经至少有三年没有用过它，所以我花了一些时间来研究它。

youdao

Since illness forced Fidel to turn over his powers two years ago, several Latin American countries have sought closer relations with Cuba.

自从疾病迫使菲德尔在两年前移交权力之后，好几个拉丁美洲的国家就在寻求与古巴建立更为密切的关系。

youdao

Walling says IBM has used the technology for its own diagnoses since 1991, and several years ago a vendor consortium called SMART developed uniform standards for reporting disk failures.

CNN: More big honkin' hard drives in 1999

Constraints include a lack of on-hand ready-to-build lots (the price of pre-developed land lots has skyrocketed), tight lending standards for small to mid-sized builders, and a notable shortage of construction workers since tradesmen fled the city several years ago and have not returned.

FORBES: Surprise! Some Cities Are Actually Experiencing Housing Shortages

The Isis payment system didn't disclose a reason for the delay, one of several since the venture was formed two years ago, only saying that it will provide an update next month.

WSJ: What's in Your Mobile Wallet? Not Much