這家工廠以前使用煤炭作為燃料。
This factory used to use coal as fuel.
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Example sentences
以前這裡有一棵大樹。
以前这里有一棵大树。
There used to be a big tree here.
很久以前，有一位仁慈的國王統治著這個國家。
A long time ago, a kind king ruled this country.
他以前是個胖子，但現在變得很瘦。
He used to be a fat person, but now he has become very thin.
我以前在等公車時會看晚報。
I used to read the evening paper while waiting for the bus.
Usage Notes
Refers to a time in the past or before a specific event.
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