题目内容
由于在地下埋得太深，枯死的深林腐烂而变成了煤。
_________ _________down in the earth, the dead forests rotted away and became coal.
Buried deep
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题目内容
由于在地下埋得太深，枯死的深林腐烂而变成了煤。
_________ _________down in the earth, the dead forests rotted away and became coal.
Buried deep