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反刍动物瘤胃液检查时，瘤胃液新鲜采集后需要用四层纱布过滤。
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is a religious allegory, a narrative in which general concepts such as sin, despair, and faith are represented as people or as aspects of the natural world.
The secret of the success of The Pilgrim’s Progress is probably simple. Its predominant metaphor --- --- is simple and familiar.
One of the most remarkable passages is that in whichand the persecution of Christian and his friend Faithful are described.
1.字符串的第1个索引是_。
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