gear的音標為[g??(r)]，基本翻譯為“齒輪；排擋；器具；設備”。速記技巧為注意發音特點，分音節速記。

Gear這個詞的詞源可以追溯到古英語中的“gear”，意為“工具”或“設備”。它的變化形式包括過去式“geared”，過去分詞“geared”和現在分詞“gearing”。

相關單詞：

1. Gearbox：變速箱，是汽車或機械中用來改變發動機轉速和扭矩的裝置。

2. Gear-head：齒輪箱操作員，通常指機械工程師。

3. Shift-gear：換擋，在駕駛中意味著從一檔換到另一檔。

4. Over-gearing：超速傳動，是指傳動比大于自然傳動的傳動，可以提高輸出功率。

5. Under-gearing：傳動不足，是指傳動比小于自然傳動的傳動，可能會導致動力不足或效率低下。

6. Gear-grinding：換擋時的齒輪摩擦，通常指換擋時齒輪的磨損。

7. Neutral gear：空擋，是汽車中的一個特殊檔位，用于停車或減速。

8. High-low gear：高低檔，是指在汽車中用于改變發動機轉速和扭矩的高低檔位。

9. Idle gear：怠速檔，是指汽車在怠速時的檔位，通常為低速檔。

10. Off-gear：脫離傳動狀態，通常指車輛或機器已經停止運行。

常用短語：

1. gear up 準備

2. gear shift 換擋

3. out of gear 在空擋

4. in gear 在擋

5. gear box 變速器

6. gear ratio 傳動比

7. gear failure 齒輪故障

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.