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1·In the process of yielding, it is unavoidable to make some ground crude oil, which is a serious pollutant to soil.

不可避免地在油田生产过程中产生大量的落地原油，对土壤造成了严重的污染。

2·By introducing the yielding level factor and constructing the ductility demand spectrum, the characteristic of peak values and frequency contents of ground motions are considered separately.

引入结构屈服水平系数，建立了结构的延性需求谱，使地震动的幅值特性和频谱特性可以分开考虑。

3·The dynamic responses of the models with mass eccentricity and under the condition of bi-directional ground motion were studied at the elastic stage and stages of cracking, yielding and failure.

研究了在质量偏心和双向地面运动情况下结构从弹性、开裂、屈服直至破坏等各阶段的地震反应。