N a bed of sand in which pig iron is cast 铸床
Mummy pig couldn't help going in the garden to check on her new residents before going to bed.
晚上睡觉前，猪妈妈忍不住又到花园里去，想再看看刺猬一家。
The little pig goes to bed immediately after supper.
小猪总是晚饭后立刻睡觉。
As a new and environmental pig-keeping technology, the method of biological fermentation bed was widely paid attention to domestically and abroad.
结合国内外的应用状况，笔者对生物发酵床养猪的技术原理及优缺点进行了探讨。
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