突变压力

Thus the necessary condition of destabilization is obtained. The cusp catastrophe of connected well roof is analyzed by beam model considering the level stress contributed by the weight of strata and geological construction.

用平直梁尖点突变模型，并考虑了自重侧压压力及水平构造应力的综合作用力研究了连通井顶板的失稳突跳，得出了连通井顶板失稳的充要条件。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。