A is a large hole the side of hill or under the ground A和is中间填什么

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A is a large hole the side of hill or under the ground A和is中间填什么
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A is a large hole the side of hill or under the ground A和is中间填什么
A is a large hole the side of hill or under the ground A和is中间填什么

A is a large hole the side of hill or under the ground A和is中间填什么
spring

i don"t know