About 300 million years ago, this was a Marine salt layer.
约三亿年前，这种盐层曾是海洋。
Safety operative technology to prevent choke in the salt layer.
预防盐膏层阻卡的安全操作技术。
Continue to layer salt and ice until it reaches the neck of the bottle.
继续添加盐层和冰层，直到它到达瓶颈。
Spread the salt evenly on each layer.
均匀撒盐在每一层芥菜上。
Spread the salt evenly on each layer.
均匀撒盐在每一层芥菜上。
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