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1·To choose the point elasticity or the arc elasticity?

选择点弹性还是弧弹性？

2·First, we seek the origin of the elasticity and the invention of the point elasticity and the arc elasticity. We also search for their original paper respectively.

文中首先寻找弹性的由来始末，以及点弹性和弧弹性的产生过程，并各自找出它们的原始文献。

3·Determination of the bending strength of gear teeth of circular-arc profile gear is very difficult due to many unknown factors, which would be also a complicated problem in the field of elasticity.

确定圆弧形齿轮轮齿强度将涉及到很多因素。就是在弹性理论上来看也是一个复杂的课题。

4·Product characteristic: Meat texture is very elasticity. Products are in arc shape, they are welcomed by many customers.

产品特点：肉质的弹性强，产品呈圆弧状，最受客户的欢迎。