Federal elections occur every two years, on the first Tuesday after the first Monday in November.

联邦选举每两年举行一次，在十一月的第一个周一之后的一天，也就是周二。

youdao

American has been studying this upgrade for more than two years and says it chose H-P after looking at every potential bidder and 15 airlines.

美国航空对这次系统升级已经研究了两年多时间，其表示，在对比每一家潜在的竞标者和15家航空公司之后选择了惠普。

youdao

After a couple of years, Robin Warren and I knew more about every aspect of ulcers than practically everyone in the world, because we read nothing else for two years.

几年以后，罗宾·沃伦和我比世界上任何人都知道更多关于胃溃疡的事情，因为两年内我们没有阅读其他任何东西。

youdao

Joy of joys, after the next film is released, there will be a new Star Wars film every two to three years after that.

FORBES: Lucas Gives Up Star Wars to Disney; Episode VII to Be Released in 2015

We also asked about this broad proposal: Increase the Social Security retirement age by one month every two years after it reaches 67 under current law.

FORBES: Voters Open to Social Security Proposals

The medal, named after the pioneer of nursing, is presented every two years and honours "exceptional courage and devotion" to wounded, sick or disabled people or to civilian victims of war or a natural disaster.

BBC: Khalil Dale