Then, we introduce a strain gradient theory and its main applications, in which no high-order stresses are included.
其次主要介绍了不含高阶应力的一类应变梯度理论及其应用；
A successful technical catalyst is required not only to have high activity, selectivity and heat-resistance, but also enough high mechanical strength in order to resist some mechanical stresses.
一种成功的工业催化剂，除具有足够的活性、选择性和耐热性外，还必须具有足够的机械强度，以便抵抗在使用过程中的各种应力。
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