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[计] 信息包交换服务, 分组交换业务
🗣️ 情景例句
Leave nothing to chance.
做任何事情都要有把握。
A little fire is quickly trodden out.
小洞易补。
He will take part in an important race across the Atlantic.
他将参加一次重大的横渡大西洋的比赛。