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每當(dāng)有人跟我聊天氣，我總覺得那肯定有弦外之音。

The Vietnamese people deeply love independence, freedom, and peace. But in the face of a threat to their country's independence and freedom, the Vietnamese people would rather sacrifice everything, not afraid to lose their lives, to defend the independence and freedom of their homeland.

控制的挑戰(zhàn)在于在存在不確定性的情況下使系統(tǒng)工作。