Plasma — an ionized gas sometimes called the fourth state of matter — typically exists at thousands of degrees Celsius, and hot plasmas are regularly used to sterilizing surgical equipment.

等离子体——一种有时被称为物质第四状态的电离气体——通常存在于上千摄氏度中，而热等离子体常常被用于外科手术器械的消毒。

youdao

One in three fourth-graders couldn't find their state on a map of the U.S.

四年级学生中有三分之一在美国地图上找不到自己所在的州。

《柯林斯英汉双解大词典》

US Secretary of State Condoleezza Rice fell from fourth place last year to seventh place.

美国国务卿康德莉扎•赖斯从去年的第四位下滑至今年的第七位。

youdao

(Speech) Earlier this month, Boit arrived in Washington State to try to qualify for his fourth and,he says,final Olympics.

VOA: standard.2010.01.22

So if we're talking about the fourth excited state, and we talk instead about principle quantum numbers, what principle quantum number corresponds to the fourth excited state of a hydrogen atom.

如果我们说的是,第四激发态，我们用,主量子数来描述，哪个主量子数对应了,氢原子的第四激发态？

麻省理工公开课 - 化学原理课程节选

This is Clinton's fourth visit to Afghanistan and first as U.S.Secretary of State.

VOA: standard.2009.11.18

After landing at Berlin's Tegel military airport earlier on Tuesday, the Queen began her fourth state visit to Germany by being driven, with the Duke of Edinburgh, to the Schloss Charlotten presidential palace in a dual-fuel royal Bentley - a German-owned company.

BBC: NEWS | Europe | Queen honours war dead in Germany

Fourth state of matter.

NPR: Serenading Science In A New Rock Album

Mali is the fourth-poorest state in the world, according to the UN, and getting poorer.

ECONOMIST: Deserving cases, getting too little help | The