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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