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Nancy：
The nineteenth of June is my birthday. I’m planning to have a small party. Could you come?
六月十九日是我的生日。我正计划举行一个小型的聚会。你能参加吗？
Robbins：
Happy birthday to you! I’d really love to come, but I’m not sure right now. I’ll try to make it. Thank you for your invitation.
预祝你生日快乐！我实在很想参加，但现在还不能确定，我会尽量参加。谢谢你的邀请。