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打ち解ける， うちとける
1. to open up (to someone), to become unreserved, to lower one's guard, to become friendly (with), to feel at ease, to take a relaxed attitude (to)
tbd
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
