阅读下面这首宋词,回答问题。
鹧鸪天·化度寺①作
吴文英
池上红衣②伴倚栏,栖鸦常带夕阳还。殷云度雨疏桐落,明月生凉宝扇闲。乡梦窄,水天宽。小窗愁黛淡秋山。吴鸿好为传归信,杨柳阊门③屋数间。
[注] ①化度寺:杭州一寺院名。②红衣:指莲花。③阊门:苏州西门,吴文英早年居于苏州。
这首词表达了什么样的感情?“栖鸦常带夕阳还”一句对表达这种感情有什么作用?(3分)
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“乡梦窄,水天宽”两句历来为人称道,请加以赏析。(4分)
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