On a four-speed box the bearings are under load 25% of the time.

四档变速箱的轴承有25%的时间受载。

youdao

The Rover-designed two-speed transfer box shares a common case with the four-speed manual gearbox and has a vacuum-operated centre differential.

Rover设计的双速转移系统与四速手动变速箱一样使用同一个箱子，并有一个真空操作中心的细微差别。

youdao

It wasn’t the optional 7.5-liter Rocket V-8 with a Hurst-shifted four-speed that made this car so cool. Or the forward-facing third-row seat waaaaaaay in the back.

这辆车实在是太酷了，看看它居然标配带有四速切换模式的7.5升V8火箭发动机，再看看第三排座椅上可拆开的天窗。

youdao

Tornadoes usually travel in a northeasterly direction with a speed of thirty-two to sixty-four kilometers an hour.

VOA: special.2010.05.11

It had a four-speed transmission and fully working transfer case, so you could switch from two- to four-wheel drive.

FORBES: Parents: Buy Kids' Legos, But Throw Away The Instructions

No, its ride-leveling suspension and adaptive dampening won't turn it into a 540i, nor can you completely ignore the fact that it has a four-speed transmission (every other car in this class gets at least five cogs in the shift box) that sends power through the front, not back wheels.

FORBES: Size XL

The Mazda5's 2.5-liter, 157-horsepower four-banger and five-speed automatic transmission are serviceable, but there's more exertion than passion underfoot here.

WSJ: 2012 Mazda5 Review: Yes to Convenience, No to Bloat | Rumble Seat by Dan Neil