gear

gear的音标为[gɪə(r)]，基本翻译为“齿轮；排挡；器具；设备”。速记技巧为注意发音特点，分音节速记。

Gear这个词的词源可以追溯到古英语中的“gear”，意为“工具”或“设备”。它的变化形式包括过去式“geared”，过去分词“geared”和现在分词“gearing”。

相关单词：

1. Gearbox：变速箱，是汽车或机械中用来改变发动机转速和扭矩的装置。

2. Gear-head：齿轮箱操作员，通常指机械工程师。

3. Shift-gear：换挡，在驾驶中意味着从一档换到另一档。

4. Over-gearing：超速传动，是指传动比大于自然传动的传动，可以提高输出功率。

5. Under-gearing：传动不足，是指传动比小于自然传动的传动，可能会导致动力不足或效率低下。

6. Gear-grinding：换挡时的齿轮摩擦，通常指换挡时齿轮的磨损。

7. Neutral gear：空挡，是汽车中的一个特殊档位，用于停车或减速。

8. High-low gear：高低档，是指在汽车中用于改变发动机转速和扭矩的高低档位。

9. Idle gear：怠速档，是指汽车在怠速时的档位，通常为低速档。

10. Off-gear：脱离传动状态，通常指车辆或机器已经停止运行。

常用短语：

1. gear up 准备

2. gear shift 换挡

3. out of gear 在空挡

4. in gear 在挡

5. gear box 变速器

6. gear ratio 传动比

7. gear failure 齿轮故障

例句：

1. We need to gear up for the big race.

2. She shifted into first gear as she spoke to the new boss.

3. The car was out of gear and we couldn"t start it.

4. The car is in second gear as I drive down the street.

5. The gearbox is a crucial component of the car.

6. The car"s gear ratio is too high, making it difficult to accelerate.

7. We had a gear failure on the mountain road and had to wait for help.

英文小作文：

Gears are essential components of any vehicle, whether it"s a car, a motorcycle, or even a bicycle. They allow the vehicle to move in different speeds and directions, depending on the situation and the driver"s needs. From shifting up and down through the gears, to keeping the right gear ratio, it"s important to understand how to use the gears effectively to ensure safe and efficient driving. However, like anything mechanical, gears can sometimes fail, which can be a major inconvenience and even a safety hazard. Therefore, it"s always wise to have a basic understanding of how to diagnose and repair gear issues, just in case.