gearbox的音標是[?ɡearb?ks]，基本翻譯是“變速器”。

速記技巧可以參考：在英文單詞中，gear常用來指機械設備等的“部件”、“零件”，box指的是箱子，結合起來指裝載、傳輸、轉換設備的部件，變速器。在記憶時可以結合實物模型或圖片進行記憶，加強記憶效果。

Gearbox這個詞的詞源可以追溯到古英語中的“geare”這個詞，意為“齒輪”。它最初是指齒輪的組合，后來逐漸演變為指整個變速箱。

Gearbox的變化形式包括復數形式“gearsboxes”，過去式和過去分詞形式“geared”和“geared-up”，現在分詞形式“gearing”。

相關單詞：

1. Gearshift - 換擋桿，是gearbox的一部分，用于改變齒輪的組合以適應不同的行駛條件。

2. Shift-up/down - 加速或減速時，駕駛員通常會通過改變gearshift的位置來移動到不同的齒輪。

3. Overdrive - 超速檔，是gearbox中的一個特定齒輪組合，通常用于提高燃油效率。

4. Gear-grinding - 齒輪磨蝕，是一種常見的機械問題，由于齒輪的過度磨損而導致的。

5. Gear-slip - 換擋滑移，是指當駕駛員換擋時，齒輪之間的滑動導致的不流暢行駛。

6. Gear-clutch - 離合器齒輪，是一種特定的齒輪組合，用于在手動變速箱中控制動力傳輸。

7. Gear-change - 換擋，是駕駛員在gearbox中移動齒輪的過程。

8. Gear-box failure - 變速箱故障，是指gearbox中的某個部件失效導致的問題。

9. Automatic gearbox - 自動變速箱，是一種使用電子控制系統的gearbox，允許駕駛員選擇不同的檔位而無需手動換擋。

10. Gear-ratio - 齒輪比，是指gearbox中不同齒輪之間的比例關系，決定了車輛的行駛速度和扭矩輸出。

常用短語：

1. gearbox replacement

2. gearbox maintenance

3. shift into gear

4. differential gear

5. main gear

6. pinion gear

7. planetary gear

例句：

1. We need to replace the damaged gearbox ASAP.

2. The mechanic is inspecting the gearbox for any signs of wear and tear.

3. When you shift into second gear, you need to accelerate smoothly.

4. The car"s differential gears are starting to make a lot of noise.

5. The main gear of the machine is very strong and reliable.

6. The pinion gear of the transmission is very small and delicate.

7. The planetary gears in this car are very efficient and smooth.

英文小作文：

Gearbox is an essential part of any vehicle, which transmits power from the engine to the wheels. It ensures smooth and efficient movement of the vehicle. However, like any other mechanical component, it requires regular maintenance and replacement when it is damaged beyond repair.

Gearbox replacement is a complex task and needs expertise and experience to carry out properly. It involves dismantling the vehicle, removing the damaged parts, and installing new ones. This process can be time-consuming and costly, but it is necessary to ensure safe and efficient operation of the vehicle.

On the other hand, regular maintenance of the gearbox can help detect any issues early and prevent them from getting worse. This includes inspecting the condition of the components, lubricating them regularly, and ensuring they are in good working condition. Regular maintenance also helps extend the life of the gearbox, reducing the need for replacement and saving money in the long run.