备份: backup...
先例: antecedent, precedent...
土生土长: locally born and bred, indigenous, home-grown...
饼干: biscuit, cracker, cookie...
炭: wood charcoal, coal...
遗忘: to become forgotten, to forget...
机制: machine processed, machine made, mechanism...
阴影: (and fig.) shadow...
扩大: to expand, to enlarge, to broaden one's scope...
专利: patent, sth uniquely enjoyed (or possessed etc) by a certain group of people, monopoly...
