coalless的音標是["k???l?s]，基本翻譯是“無煤的”。

速記技巧：直接根據單詞的字母進行拼寫，無需特殊的速記技巧。

coalless:

詞源：coal（煤）去掉后綴-o-和-l，加上前綴co-構成。

變化形式：無變化。

相關單詞：

1. coals（煤）：來源于coal，表示“煤”。

2. coalmine（煤礦）：由coal和mine組合而成，表示“煤礦”。

3. coalfield（煤田）：由coal和field組合而成，表示“煤田”。

4. coalbed（煤層）：由coal和bed組合而成，表示“煤層”。

5. coalburning（煤燃燒）：由coal和burning組合而成，表示“煤的燃燒”。

6. coalpower（煤發電）：由coal和power組合而成，表示“煤發電”。

7. coalminer（礦工）：指從事煤礦開采工作的工人。

8. coalbed methane（煤層氣）：指儲存在煤層中的天然氣。

9. coalbed gas（煤層氣）：指儲存在煤層中的氣體，通常用于發電等用途。

10. coal-fired（燃煤的）：表示使用煤炭作為燃料的。

以上這些單詞都與煤炭有關，反映了煤炭在工業和能源領域的重要地位。同時，這些單詞也體現了英語詞匯的多樣性和靈活性。

常用短語：

1. coal-fired power station 燃煤發電站

2. coal mining 采煤

3. coal-bed methane 煤層甲烷

4. coal ash 煤灰

5. coal-to-liquid 煤制液體燃料

6. coal-to-power 煤電化聯合生產

7. coal-fired boiler 燃煤鍋爐

雙語例句：

1. The country"s largest coal-fired power station is being built in the northwestern region.

2. The mine has been operating for years and has become a symbol of China"s economic growth.

3. The government is trying to promote the development of clean energy to reduce emissions of greenhouse gases.

4. Coal mining has caused environmental problems such as soil erosion and water pollution.

5. The coal-to-liquid process has the potential to reduce the country"s reliance on imported oil.

6. Coal-fired boilers are widely used in factories and households to generate electricity and heat.

英文小作文：

Coal is a crucial source of energy for many countries, but it also causes environmental problems such as air pollution and greenhouse gas emissions. At the same time, renewable energy sources such as solar and wind power are becoming more popular, but they still have limitations. Therefore, coal-fired power stations are still necessary for meeting the energy needs of many people, but they must be operated in a sustainable way to minimize environmental impacts. In order to achieve this goal, it is necessary to improve technology and adopt more efficient methods of coal mining and processing. At the same time, we must also promote the development of clean energy sources to reduce our dependence on coal and other fossil fuels. In the long run, this will help us to protect the environment and ensure sustainable development.