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約束を破る， 約束をやぶる， やくそくをやぶる
1. to break a promise, to go back on one's word, to renege
违背承诺；食言；违约
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
