unless invite to speak
除非被邀请发言
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And don't speak for that other person (i.e order for them at dinner) unless they invite you to help with their order.
也不要帮对方说话（如当点餐时），除非他们邀请你帮他们点餐。
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