Teeth have a hard surface layer called enamel.
牙齿有一层叫做釉质的坚硬表层。
Most Roman pottery is light and smooth to touch and very tough, although, like all pottery, it shatters if dropped on a hard surface.
大多数罗马陶器轻巧而光滑，摸起来很硬，但像所有的陶器一样，如果掉在坚硬的物质上就会碎裂。
Try switching running surfaces (if you've been running on a hard surface, try a softer one or vice versa).
换一种路面去跑步(如果你跑步的路面很硬，就应该试着在软一些的地方跑，反之亦然)。
Ideally, a large proportion of rainfall should be absorbed by the ground. Clearly, such a process is not possible on a hard surface.
大部分降雨理论上应该被地面吸收，对硬地面来说显然不行。
The tie will be held in Sweden on an indoor hard surface (again) and both of these guys are great indoor players (Nalbandian is more accomplished but the Swede is in better form).
主场是瑞典人的地盘，对阵双方又都是室内作战的能人（纳尔班迪安技高一筹，但瑞典人也在状态）。
The hard surface is one key factor of urban heat effect.
硬化路面是城市热环境效应影响因素中较为重要的一个因素。
Applied on all resilient floor and hard surface which need to wax.
所有需要打蜡的弹性或硬质地面。
It made it more slippery with the sand on top of the hard surface.
由于赛道表面有很多沙子，显得比较滑。
Understanding polygonal subdivision and how it relates to hard surface modelling.
了解多边形细分及其与硬表面建模的关系。
Siemens FLD gear Units: Chinese standard of hard surface gear unit origins from FLD standard.
西门子弗兰德减速机：中国硬齿面减速机的标准源于弗兰德。
Convenience as well as primary cleaning performance have become one of the most important claims of modern hard surface cleaners.
方便并具有基本的清洁能力已经成为现代硬表面清洗剂一个重要的诉求点。
Grinding gear with the toroidal involute interior thread worm grind wheel is a new kind of process in hard surface gear finish machining.
渐开面包络环面内螺纹蜗杆砂轮磨齿，是一种硬齿面齿轮精加工的新型工艺。
Grinding gear with the toroidal involute interior thread worm grind wheel is a new kind of process in hard surface gear finish machining.
针对面齿轮硬齿面磨削加工中存在的困难，提出用蜗杆砂轮磨削的双参数法来磨削面齿轮。
We offer tailor-made cleaning detergents and maintenance programs for every type of hard surface, like natural stone, floor, brick or plastic.
天然石材，地板，地砖，塑胶等每一种地面类型，我们都为您设计专有的清洁剂和保养程序。
There is an obvious disparity between our nation and other developed nations in the field of hard surface finish machining of the spiral bevel gear.
在螺旋锥齿轮硬齿面精加工这一环节上，我国与发达国家的差距尤为明显。
In addition, considering a lot of household products made of various plastic materials, modern hard surface cleaners also require protection and safety for surfaces.
此外，考虑到大量的家用产品是由各种塑料制成的，现代硬表面清洗剂也要求对表面安全并具有保护效果。
This product can enhance the performance of a broad spectrum of hard surface cleaner formulations for use in household, institutional, automotive, avionic, food, hygiene and industrial applications.
该产品可加强用于硬表面清洁产品的效能，用途十分广泛，包括家居护理、工业清洗、汽车清洗、飞机清洗和食品卫生方面。
Through analyzing the problem of short life of gears in the main gearbox, the design programme for composite hard-surface gears in high-speed level is described.
通过对主减速机齿轮寿命不足问题的分析，提出了在高速级采用组合式硬齿面齿轮的设计方案。
Through analyzing the problem of short life of gears in the main gearbox, the design programme for composite hard-surface gears in high-speed level is described.
通过对主减速机齿轮寿命不足问题的分析，提出了在高速级采用组合式硬齿面齿轮的设计方案。
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