The increase in brightness of the x-ray sources over the same period has occurred far faster.

在同一时期内，X 射线光源亮度的增加速度要快得多。

youdao

The stethoscope is older than the x-ray, the ballpoint pen, Popular Science and pretty much everything else in your doctor's office.

听诊器比 X 射线、圆珠笔、《大众科学》以及你医生诊所里绝大部分物件还要古老。

youdao

For velocity in the x, y, or z direction.

对于x，y，或z三个方向的速度。

youdao

The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

The highest probability now is going to be along the x-axis, so that means we're going to have a positive wave function every place where x is positive.

概率最高的地方是沿着ｘ轴，这意味着只要在ｘ,大于零的地方波函数都是正的。

麻省理工公开课 - 化学原理课程节选

This is saying, that's a class, true or sorry, an instance of a class, and I'm going to get the x value associated with it.

那么两个点是同一个点，我会返回，注意格式，这儿的意思是,它是一个类，噢对不起。

麻省理工公开课 - 计算机科学及编程导论课程节选

With the X headphones, it's like being in the recording studio when the records are made.

ENGADGET: Sony and Simon Cowell intro X Factor-themed MDR-X10, celebrity headphones officially jump the shark for $300

In addition, Nissan imports and markets the X-Trail SUV and the 370Z sports car in India.

WSJ: Renault, Nissan Expanding Capacity of India Joint-Venture Plant

That meant the mutation was almost certainly on a gene on the X chromosome.

FORBES: A Tragic Case And A Genomic Hope