At 84, John feels his age precludes too much travel.

在84岁时，约翰感觉到他的年龄不允许他作太多的旅行。

《柯林斯英汉双解大词典》

The exact measurements of the room are 3 metres 20 by 2 metres 84.

这间屋子的准确尺寸是长3.20米，宽2.84米。

《牛津词典》

Although he was 84, he could still play basketball.

他虽然84岁了，但还能打篮球。

youdao

Finance Minister Hirohisa Fujii described himself as "extremely nervous" Friday, after the dollar slid toward 84 yen.

VOA: standard.2009.11.27

And what we end up with for the energy then is 2.84 times 10 to the -19 joules.

我们算出的能量是,2，84乘以10的-19次方焦耳。

麻省理工公开课 - 化学原理课程节选

So for every photon we have 2.84 times 10 to the -19 joules.

每一个光子有,2，84乘以10的-19次方焦耳。

麻省理工公开课 - 化学原理课程节选