at a speed of

at a speed of 的音标为 [ə] [ə] [spɪːd] [v] [eɪt] ，翻译为“以……速度”。

关于速记技巧，一种常用的速记技巧是使用视觉代码。视觉代码是一种将信息转化为视觉图像的编码系统，可以帮助人们快速记录和回忆信息。另一种常用的速记技巧是使用缩写和符号，将信息简化为更少的字符，从而加快记录和回忆的速度。此外，一些人还使用手写速记技巧，通过快速书写和手部动作来记录信息。这些技巧需要练习和时间来提高速度和准确性。

at a speed of 的英文词源是：

- speed：速度

相关单词及其变化形式和解释如下：

1. speedily：迅速地，很快地

词源同speed，时间。

例句：The company is speedily developing new products.

翻译：这家公司正在迅速地开发新产品。

2. accelerate：加速

词源同accelerate，加速，使加快。

例句：The car accelerated smoothly.

翻译：汽车加速平稳。

3. decelerate：减速

词源同decelerate，减速，使慢下来。

例句：The driver had to decelerate to avoid hitting the child.

翻译：司机不得不减速以避免撞到那个孩子。

4. velocity：速度

词源同velocity，速度，快速。

例句：The velocity of the bullet was too high.

翻译：子弹的速度太高了。

5. speed limit：速度限制

词源同speed，速度，limit，限制。

例句：The driver was fined for exceeding the speed limit.

翻译：司机因超速行驶被罚款。

6. speedometer：速度计

词源同speed，速度，meter，计量器。

例句：The speedometer on the car showed 120 kilometers per hour.

翻译：汽车的速度计显示时速120公里。

7. rush：匆忙；冲；奔腾；喧闹声

词源同rush，冲，急速流动。

例句：She rushed into the room, crying out for her baby.

翻译：她冲进房间，大声呼喊她的孩子。

8. swift：敏捷的；迅速的；流畅的；直接的；无暇的；迅速的行动；迅速的转变；迅速的行动方式；快速移动；迅速变化；迅速发展。

词源同swift，快速移动的。

例句：The swift current of the river carried the boat downstream.

翻译：河水的急流把小船带往下游。

9. rapid：快速的；迅速的；敏捷的；猛烈的；急剧的；突然的。

词源同rapid，快速的。

例句：The rapid rise in the price of oil has caused concern.

翻译：石油价格的急剧上涨引起了人们的担忧。

10. express：（速度快的）快车；快递；特快专递；表达；显示；明确表示；用表情或图画表示。

词源同express，表达、显示或表达出来。

例句：He sent an express letter to his mother.

翻译：他给母亲发了一封特快专递信。

常用短语：

1. at a fast speed

2. at a medium speed

3. at a slow speed

4. accelerate to a speed

5. decelerate to a speed

6. maintain a constant speed

7. vary speed according to circumstances

例句：

1. The car accelerated to a speed of 60 miles per hour.

2. We had to decelerate to a speed of 30 miles per hour to avoid hitting the car in front of us.

3. The driver maintained a constant speed of 65 miles per hour through the mountainous roads.

4. We varied speed according to the traffic conditions and managed to arrive at our destination on time.

5. The train was travelling at a fast speed when it hit the truck.

6. The boat was sailing at a medium speed when it encountered a strong current.

7. We need to slow down and adjust our speed to avoid getting caught up in traffic jams.

英文小作文：

The importance of maintaining a constant speed while driving is crucial for safety and fuel efficiency. When driving at a constant speed, you can avoid sudden braking or acceleration, which can lead to unnecessary wear and tear on the vehicle and increase fuel consumption. Additionally, driving at a constant speed helps maintain a safe distance between vehicles, allowing you to react quickly if necessary. By consistently maintaining a speed that is appropriate for the road conditions and traffic, you can avoid accidents and ensure your own and others" safety on the road.