Work stress, money problems, family relation, etc.
工作压力、金钱问题、家庭关系等等。
However, the relation between the stress and the strain is nonlinear.
但却明显地表现出非线性的应力-应变关系。
The relation between stress and strain of upper or lower flange is linear.
上下翼缘应力与应变关系均为直线。
Stress and its relation to force and moment;
应力及它与力、力矩的关系；
Stress and its relation to force and moment;
应力及它与力、力矩的关系；
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