Stay away from trouble - Avoid the things that steal pleasure and replace it with stress.
远离麻烦——远离那些让你不快乐，增加你压力的事情。
2
The results show that the crane is unnecessary to replace for its low total stress level and large strength margin of the main girder (main stressed part).
计算结果指出：门机结构总体应力水平较低，其严重受力件主梁具有较大的强度富裕度，不必更换。
3
If you're trying to change a negative habit (quit smoking), replace it with a positive habit (running for stress relief, for example).