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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