阅读下面这首词，回答问题。
菩萨蛮·宿水口
[南宋] 洪瑹
断虹远饮横江水，万山紫翠斜阳里。系马短亭西，丹枫明酒旗。   浮生常客路，事逐孤鸿去。又是月黄昏，寒灯人闭门。
古典诗歌在景物描写时常“以画入诗”，简析词的上阕是如何体现这一特点的？
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简析词的下阕所表达的思想感情。
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