Pef
abbr. peak expiratory flow 最大呼气流量; personal effects floater (policy) 私人物品保险,私人行李保险
🗣️ 情景例句
I get off one job and go straight to another.
我辞了工作后马上又开始了另一个。
Modern industry is based on the conception of the maximum production at lowest cost,
以最低成本获取最多产品,
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