单词学习：painstakingly 副词
painstakingly
/ˌpeɪnzˈteɪkɪŋli/
adv. 煞费苦心地；费力地；精心地
Gu Laoshi painstakingly prepared detailed notes for each student to ensure they understood the complex grammar rules.
顾老师煞费苦心地为每个学生准备了详细的笔记，以确保他们理解复杂的语法规则。
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