Drugs that need a doctor's prescription became a bigger part of the debate over health care costs in two thousand three.

VOA: special.2009.08.14

One over two squared minus one over n squared 3 4 5 where n takes values three, four, five, six.

除以，2，的平方再减去1除以n的平方,将n赋值为。

麻省理工公开课 - 固态化学导论课程节选

In nineteen eighty-three, he began to study more than twenty-two thousand healthy male doctors over forty years of age.

VOA: special.2009.10.20

New restrictions on the powers of the Lords were introduced in the 1949 Parliament Act which reduced the time peers could delay a bill from two years over three parliamentary sessions to one year over two parliamentary sessions.

BBC: What is the Parliament Act?

Peers would only be able to reject a Bill for two years over three successive parliamentary sessions.

BBC: What is the Parliament Act?

Tipton recommends five three- to five-minute immersions -- either one a day or stretched out over two to three days.

CNN: Are polar bear plunges good for you?