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予約， よやく
1. reservation, appointment, booking, advance order
2. contract, subscription, pledge
3. programming (e.g. a device), setting (e.g. a timer)
预约，预订；订阅
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
