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触れ合う， 触れあう， ふれあう
1. to come into contact with, to touch (each other), to have a brush with
接触，触碰（彼此），擦肩而过
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
