阅读下面这首诗歌,回答问题。
东马塍[注]
[宋] 朱淑真
一塍芳草碧芊芊,活水穿花暗护田。
蚕事正忙农事急,不知春色为谁妍?
[注] 东马塍:地名;塍,田间的土埂子。
第二句中“暗”字用得最传神,请简要赏析。(3分)
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第三、四两句表达了作者怎样的情感?请简要分析。(4分)
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