惧高症的儿童可从负高度进行平衡木训练。
The children having the acrophobia can be undertaken the balance beam training from the negative height.
除了负的热膨胀效应，研究人员也发现了温度改变引起的材料多孔性的明显改变，因而这种多孔性就变得高度可控。
Besides negative thermal expansion, the researchers also found that changes in temperature lead to a significant variation in the porosity of the material, which is therefore highly controllable.
本文还介绍了为提高复合片钻头经济指标的诸钻头参数设计的理论根据，如负前角、旁通角、出露高度、复合片布置等等。
The present paper also introduces the theory for the design of bit parameters in order to improve the economic target, such as negative rake angle, bypass angle and the exposure height.
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