She dutifully completes the homework assigned by her teacher every day.

dutifully 是形容词 dutiful（尽职的、尽责的）加上副词后缀 -ly 构成的副词形式。dutiful 来自名词 duty（责任、义务），表示"履行责任的、尽职的"。 dutifully 作为副词，意思是"尽职尽责地"，描述一种认真负责地完成义务或任务的态度。