There are 700 sensors on the Ares I-X rocket to measure things like vibration, speed, performance and other data.

战神I-X上有700多个传感器来测量如振动，速度，性能及其他数据。

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The X-ray pulses have a shutter speed of less than 100 femtoseconds (100 femtoseconds = 1/10 of a trillionth of a second).

这种X光脉冲快门速度不到100飞秒（100飞秒= 万亿分之一秒的1/10）。

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The announcement is part of a larger upgrade for Parallels which now supports enhanced speed, performance and graphics, including Direct X 9.

这一宣布是Parallels公司的重大升级的一部分，现在已经支持增强速度，性能和显示，包括Direct X 9。

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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

Physicists use super-powerful magnets to speed particles and control radiation like X-rays.

VOA: special.2010.10.08

The X-15 set height and speed records greater than those expected.

VOA: special.2010.07.07

The highly responsive linear motor in the XF18-55mm lens combines with the high-speed signal readout of the X-Trans CMOS sensor and the EXR Processor Pro, to achieve a huge leap in AF speed and precision performance.

ENGADGET: Fujifilm grows X-series mirrorless lineup with 16.3-megapixel X-E1

To return to the matter of stopping: The Stealth-X designers envision riders controlling their speed by carving like a downhill skier and stopping by kicking the sled sideways in a skilike spray of snow.

WSJ: Snolo Stealth-X Review: A Pricey Way to Zip Down Your Private Mountain | Rumble Seat by Dan Neil

In addition to the iFrame video format (960 x 540), the cameras can record in High Definition 1080P (1920 x 1080), as well as high speed video formats for slow motion playback.

ENGADGET: Sanyo unleashes two iFrame compatible Dual HD camcorders