A tone must have a pitch, the object of the sense of touch a hardness, etc.
音调必须具有一种高度，触觉对象必须具有一种硬度，等等。
The polyolefin foamed plastics have the characteristics of good tensile strength, stiffness and hardness, etc, which lead to its extensive application in automobile.
聚烯烃泡沫塑料具有较好的拉伸强度、刚度及硬度等特点，在汽车上得到广泛的应用。
The wig crocheting needle for the decorative headgear machine has the advantages of strong crocheting ability, good rigid strength, great hardness, etc.
本装饰头套机用假发钩针具有穿刺能力强、刚性强度好、硬度大等优点。
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