To vow never to change one's mind or loyalty; to pledge unwavering steadfastness and devotion.
这对夫妻在婚礼上立下誓言，此生誓无二心，共同面对生活中的一切挑战。
At their wedding, the couple made a vow, pledging unwavering devotion to each other for life, ready to face all of life's challenges together.
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