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Lot number
The batch number should be marked clearly on every container.
the date of pack which may be shown as a lot number or production code number;

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Open the tool →批号 (pī hào) means “Batch number, Lot number”.
批号 is pronounced pī hào in Mandarin Chinese.
“Batch number” is 批号 (pī hào) in Chinese.
This page has 2 example sentences using 批号, each with pinyin and an English translation.