求翻译：机会是可遇而不可求的，机会可以影响四大要素发生变化。波特指出，对企业发展而言，形成机会的可能情况大致有几种：基础科技的发明创造；传统技术出现断层；外因导致生产成本突然提高（如石油危机）；金融市场或汇率的重大变化；市场需求的剧增；政府的重大决策；战争。机会其实是双向的，它往往在新的竞争者获得优势的同时，使原有的竞争者优势丧失，只有能满足新需求的厂商才能有发展“机遇”。是什么意思？

Opportunities are scarce, the opportunity to influence the four elements of change. Porter pointed out that, on enterprise development, the formation of the opportunities possible, generally categories: basic science and technology inventions; gap in traditional technologies; external cause producti

It is opportunity to be the case, the opportunity to impact the 4 elements. Porter pointed out that for enterprise development, the opportunity may be a more or less: There are several basic technology innovations; traditional technology has created a fault; exogenous factors lead to a sudden increa

Opportunities are available and not for the sake of, opportunities to influence changes in the four elements. Porter notes that, on enterprise development, formation opportunities possible, there are several: basic science and technology invention of traditional technical fault occurs; external fact