阅读下面一首元曲,完成后面问题。
朝天子·秋夜客怀
[元]周德清
月光,桂香,趁着风飘荡。砧声催动一天霜。过雁声嘹亮。叫起离情,敲残愁况,梦家山身异乡。夜凉,枕凉,不许离人强。
“叫起离情,敲残愁况”一句中“敲残”二字有何妙处?(4分)
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本曲描写了哪些的意象?表达了什么样的感情?请简要分析。(4分)
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