W. E. B. Du Bois's mother was a domestic worker and his father was a barber.

杜博斯的母亲是一位佣人，而他的父亲是一位理发师。

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Please be careful not to pile up P. W. B. after switches were soldered.

开关焊接以后，印刷基板注意不要叠放。

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Please be careful not to pile up P. W. B. after switches were soldered.

开关焊接以后，印刷基板注意不要叠放。

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