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お腹が空く, お腹がすく, おなかが空く, おなかがすく
1. to become hungry, to get an empty stomach
变得饥饿,感到空腹
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