Postal materials: referring to mail, printed matter, postal parcels, money orders, newspapers, periodicals, etc. posted and delivered by postal enterprises.
邮件：指通过邮政企业寄递的信件、印刷品、邮包、汇款通知、报刊等。
As engaged in printed circuit chemical materials research, development and production of specialized enterprises, we must not only help the circuit board manufacturers improve product quality.
作为从事印制电路化学材料科研、开发、生产的专业化企业，我们不仅要帮助电路板生产厂商提升产品质量。
Postal materials refer to mail, printed matter, postal parcels, money orders, newspapers, periodicals, etc., posted and delivered by postal enterprises. mail refers to letters and postcards.
指通过邮政企业寄递的信件、印刷品、邮包、汇款通知、报刊等。信件：指信函和明信片。
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