synthetic materials (n) man-made materials 人工合成材料

　　[例]　It hope to be making 200 million of its synthetic corks a year by the end of the decade.

　　materials handling (n.) efficient movement of materials from one part of the factory to another材料运转管理[例]  This enterprise has an efficient material handling ability.

　　maternity leave (n) time off work allowed by law to a woman for her birth-giving 产假

　　[例]　She is now on her maternity leave and will be back in office next month.

　　matrix management (n.) management system under which a manager has to report to two bosses in different parts of the organization距阵管理系统

　　[例]  Nowadays matrix management is very popular among companies.

　　mature (v) due for payment到期

　　[例]　The insurance policy matures on the 3rd, March.

　　[同义词]expire , due