边材易于保存，但是硬材不易保存。
硬材树种除热带地区以外，均为落叶树。
Hardwood trees are deciduous trees, except in the warmest regions.
硬材有许多种，如乌木、各种桃花心木、枫树、柚木和美国黑胡桃木。
Included in the category are ebony, various mahoganies (see mahogany family), maple, teak, and American Black walnut.
锯片呈平齿交叉斜齿，具有防反弹的保护设计，适用于切割各种有树节的干燥软、硬材。
Saw blades with alternate top bevel teeth and anti-kicking back device, are suitable for cutting soft and hard wood with knots.
夏威夷遗产硬材公司正在实施一个通过无线射频识别标签(RFID)跟踪金合欢(Koa)的树木和木材。
Hawaiian Legacy Hardwoods is mounting an intriguing new project to use RFID to track the growth and sale of its heirloom Koa trees and lumber.
目的：研究复合树脂对医用钛材和牙体硬组织的粘结性能。
Objective: To investigate the bonding effect of composite resins on titanium materials and dental hard tissues.
这类产品包括许多稀有金属或贵金属，贱金属或合金带材或各种形状的挤压型材，某些轴承金属，某些硬软磁性材料等。
Examples of this class include many of the rare or precious metals, strip or extruded shapes in base metals or alloys, some bearing metals, some hard or soft magnetic materials, etc.
制备了用于聚氨酯真空隔热板的开孔硬泡芯材，该泡沫芯材的开孔率达95%。
A open cell polyurethane rigid foam for vacuum panel core material was prepared. The open cell percent of the core material is about 95%.
本文叙述了硬聚氯乙烯片材在热成型过程中的性能及变化规律。
It is related that the performance and regularity of which rigid PVC sheet is treated in forming process.
研究了木废料能源联合干燥短周期工业材的杨木、马尾松以及常用硬阔叶材的柞木等。
This paper reported that it was feasible to apply combined drying method to dry fast growing trees lumber such as Pouples, Massoniana and hardwood such as Oak, etc, with wood wastes as energy.
对利用热水作为热导介质干燥南方硬阔叶材进行了开发与研究，并对经济效益进行分析和比较。
Developed and studied drying technique which used hot water as a heat conduction medium drying north hard broadleaf timber, analysed and compared its economic benefit.
吸塑原理：将平展的塑料硬片材加热变软后，采用真空吸附于模具表面，冷却后成型。
Plastic principle: the flat plastic sheet heating soft, using vacuum adsorption in the surface of the die, formed after cooling.
吸塑原理：将平展的塑料硬片材加热变软后，采用真空吸附于模具表面，冷却后成型。
Plastic principle: the flat plastic sheet heating soft, using vacuum adsorption in the surface of the die, formed after cooling.
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