阅读下面这首诗,回答问题。
碛西头送李判官入京
岑 参
一身从远使,万里向安西。
汉月垂乡泪,胡沙费马蹄。
寻河[注]愁地尽,过碛觉天低。
送子军中饮,家书醉里题。
[注] 寻河:历史记载张骞出使西域时曾经去寻找黄河的源头。
“汉月垂乡泪,胡沙费马蹄”一联运用了多种表达技巧,请举出其中两种加以分析。(4分)
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这首诗抒发了作者怎样的思想感情?请结合诗句简要分析。(3分)
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