阅读下面这首清词，完成问题。
蝶恋花
[清]纳兰性德
又到绿杨曾折处。不语垂鞭，踏遍清秋路。衰草连天无意绪，雁声远向萧关去。　　不恨天涯行役苦。只恨西风，吹梦成今古。明日客程还几许，沾衣况是新寒雨。
“不语垂鞭”一句刻画出词人怎样的形象？(3分)
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请从景与情的角度简析“衰草连天无意绪，雁声远向萧关去”。(4分)
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