To swear by heaven and one's heart; to vow with utmost sincerity and firm resolve, often indicating unwavering loyalty or strong determination.
她指天誓心，无论遇到什么困难，都一定会坚持到底，完成这项重要的任务。
She swore by heaven and her heart that no matter what difficulties she encountered, she would persevere to the end and complete this important task.
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