解释下列加点的词语。
1.而
①籍吏民,封府库,而待将军(《鸿门宴》)
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②以其求思之深而无不在也(《游褒禅山记》)
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③然陈涉翁牖绳枢之子, 隶之人,而迁徙之徒也(《过秦论》)
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④余方心动欲还,而大声发于水上(《石钟山记》)
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