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四级精度
1、grade───n.年级；等级；成绩；级别；阶段；vi.分等级；逐渐变化；n.(Grade)人名；(英)格雷德；(法、德、西、葡、塞、瑞典)格拉德；vt.评分；把…分等级
2、rough it───v.生活简单；因陋就简地生活；生活简单
3、rough───adv.粗糙地；粗略地；粗暴地；adj.粗糙的；粗略的；粗野的；艰苦的；未经加工的；n. (Rough)（英）拉夫（人名）；vi.举止粗野；vt.使粗糙；粗暴对待；草拟；n.艰苦；高低不平的地面；未经加工的材料；粗糙的部分
4、rough outline───粗糙的轮廓；粗线条
5、play rough───比赛时做粗野动作；耍粗暴作风，作粗BaoDong作；粗暴行为
6、rough draft───草稿；底子；草图; 草稿
7、rough seas───中浪；波涛汹涌的海面
8、rough-cast───粗抹灰
9、rough work───n.粗活；暴力；粗制的东西；n.粗活，暴力，粗制的东西
1、I had some rough years, but finally made it to 8th grade, where I would change to a bigger school with a new teacher.───我渡过了艰苦的几年，最后到了8年级，当时我可以去一个大学校见到新老师。
2、After experiencing a particularly rough time in a calculus class during his sophomore year at UCLA, Mike Moradian began to think students could benefit from knowing more about how professors grade.───在加利福尼亚大学洛杉矶分校(ucla)二年级学习微积分课程时，Moradian经历了一段特别痛苦的时间。在那之后Mike Moradian就想：如果学生们对教授本人的评级了解的越多，那么他们一定会从中受益。
3、But the question is: smaller production capacity, variety Grade little rough, the size of suspended more PTFE resin products, resins and fine-grained less.───但存在的问题是：生产能力较小，品种牌号不多，粗、中粒度的悬浮ptfe树脂产品较多，而细粒度树脂较少。