Glioblastoma is one of the most aggressive brain tumors, killing nearly every patient within two years.

恶性胶质瘤是侵袭程度最高的脑瘤之一，病人存活时间基本不超过两年。

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The award is given every two years. The most recent one was given last year.

这个奖每两年颁发一次，最近的一次是上一年。

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One out of every four Germans today is older than 60, and in 30 years the proportion will rise to two-fifths.

今日每四个德国人中有一个年龄超过60岁，30年后这一比例会上升到五分之二。

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In two thousand two the group had suggested such screening tests every one to two years for women forty and older.

VOA: special.2009.11.18

The United States Library of Congress appoints an official poet, called the Poet Laureate, every one to two years.

VOA: special.2010.04.05

The new guidelines say women age twenty-one to twenty-nine only need to get a Pap test every two years instead of yearly.

VOA: special.2009.11.25

Most of us are locked into contracts that only make it money-smart to buy a new one every two years.

ENGADGET: This is the Modem World: You Use THAT?

While the annual number of assassination attempts has been increasing (currently around one every two years), there are a lot more countries (and thus more leaders) than there were in the early 20th century.

ECONOMIST: Killing a leader doesn't always work

The RNIB says that children under 16 and adults over 60 should have an annual eye test and the rest of the population should have one every two years unless they have been advised otherwise.

BBC: Photo of an eye examination