Really the only option they had was to rely on something called dead reckoning, basically figuring out where you are by estimating your speed and compass heading to plot your journey.

实际上他们唯一的选择是依靠一种名为航位推算的方法，大体通过估计航速和南来确定你的位置，从而规划航程。

Aircraft engines are optimised for level flight at cruising speed in the stratosphere.

飞机引擎被调校以适应在平流层以巡航速度水平飞行。

Their maximum speed of 40 miles per hour is faster than that of a great white shark or orca whale, and even at their comfortable cruising speed, they can cross the Atlantic in a couple months.

它们最高时速可达 40 英里每小时，比大白鲨或是虎鲸还快，即使是以它们日常的巡航速度，也可以在两个月内横跨大西洋。

The log indicated a mean speed of between eight and nine miles.

经常被抛下水去测量航速的测程器出航行的平均时速是八海里至九海里。

Their longboats are fast, rugged, Designed to navigate the most treacherous waters on earth.

维京大战船航速快抗击打能力强，足以抵御世界各地最为危险的恶水险境。

This greatly reduced the speed of the ship, for there was a danger that if she travelled too quickly, this rudder would be torn away as well.

这样一来，大大降低了船的航速。因为船不能开得太快，否则就有危险，应急舵也会被刮走。

'Thank you, sir, ' said the seaman, touching his forelock. 'I'm just off a two-yearer in an eight-knot tramp, short-handed at that, and I wants arest. I thought I'd get it either with Mr. Beddoes or with you.'

'谢谢你，先生，'水手掠一掠他的额发说道。'我刚刚下了航速为八海里的不定期货船，在那上面我干了两年，偏偏手又少，所以息。我想我只好去找贝多斯先生或来找你了。'

The vessel which reaches 103 meters long is designed to have a draft displacement of 9,200 metric tons, with the maximum speed of the vessel reaching 16 knots, equivalent to about 30 kilometers per hour.

设计船长约 103 米、设计吃水排水量约 9200 吨，最大航速 16 节（相当于大约每小时 30 公里）。

The Pilot had, however, mistaken the skill and readiness of their foe; for, notwithstanding the disadvantageous circumstances under which the Englishman increased his sail, the duty was steadily and dexterously performed.

然而，敌舰迅速敏捷的应变能力，还是超出了领航员的估计与判断，尽管面对英国加大航速的不利局面，美军防卫舰并未乱了阵脚，船舰仍然正常有序行进。

He nodded, then added, " Or he wouldn't be keepin' up such a clip" . He gave a short chuckle. " They're gettin' anxious up there" .

他点点头，又补充道，" 不然它就不会保持这样的航速了，" 他发出咯咯一声短笑，" 上面的怕是急坏了。"

This greatly reduced the speed of the ship, for there was danger that if she travelled too quickly, this rudder would be torn away as well.

这样一来，大大降低了船的航速。因为船不能开得太快，否则就有危险，应急舵也会被刮走。

The nine-passenger plane will be able to fly for one hour, with a max cruise speed of 460 kilometers per hour.

这架可乘坐 9 的飞机将能够飞行 1 小时，最大巡航速度为每小时 460 公里。

Titanic's engines used more than 800 tons of coal each day. The ship's top speed was 24 knots.

泰坦尼克号的引擎每天消耗超过800吨煤炭。船的最高航速为24节。

And we'll travel up to 50 knots.

我们的航速可达50节。

So commercial aircraft take advantage of the jet stream, and then they fly along the jet stream to make the flight faster, but then they have to fly against it on the way back, so it is actually slower.

商用飞机利用急流，沿着急流飞行以加快航速，但返程时则必须逆急流飞行，因此实际速度反而更慢。

Then once it's in the air cruising at 70 miles per hour, it navigates its way to the hospital, and upon arriving, opens the trap door to drop the package, which lands safely using a parachute.

一旦升空并以每小时70英里的巡航速度飞行，它便自主导航前往医院，抵达后打开舱门投放包裹，包裹借助降落伞安全着陆。

This massive ship is powered by a Rolls-Royce nuclear-pressurized water reactor which gives it a top speed of around 25 knots(29 miles per hour) when submerged.

这艘巨大的船只由罗尔斯-罗伊斯核动力压水反应堆提供动力，下潜时最高航速可达25节（约29英里/小时）。

Eventually, I reach the function I want to trigger: " Car, then engine, then cruise control, then set cruise speed to 55" .

最终，我找到了想触发的功能：“汽车，然后发动机，然后巡航控制，然后将巡航速度设置为55”。

Okay, so 85% of max intensity for me would be staying at cruising pace and occasionally bumping up the speed a little bit.

好的，对我来说，最大强度的85%意味着保持巡航速度，并偶尔稍微加快一点速度。

So we have very, very low wind and we're moving at like one and a half to two knots.

所以我们风非常非常小，航速大约是每小时一到两海里。