1. To take on coal. 
   装煤，加煤
2. I am striking the door continuously. 
   我一直在炉火上加煤。
3. I have added the coal on the flame. 
   我已在炉火上加了煤。
4. The fire will go out if you don't put some more coal on it. 
   如果你不往火炉上多加些煤，火就会灭了。
5. He was feeding coal to the furnace. 
   他在给炉子加煤。

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