地震前兆的产生是“双力源”即构造应力和流体力联合作用的结果；
Seimic precursor occurrence is the result from the action of "double force source", namely tectonic stress and the subsurface fluid force.
同时对外载等效中经常出现的横向双力矩这一广义力进行研究，指出它在开口和闭口薄壁梁约束扭转问题中和圣维南原理适用条件中分别占有不同的地位。
A new point is put forward that transverse bimoment has different influence on the two kinds of cross section thin-walled beams, and on their St-Venant principle conditions.
南家再叫2S，这是所谓的超转移，承诺有四张红心支持，高限牌力，通常是有个双张。
South rebid two spades, a so-called superaccept promising four-card heart support, a maximum and, typically, a doubleton somewhere.
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