This has become a quick fix to the "failure" of national production – increasing food supply has become a substitute for a real food security policy.
增加食物供给已成为每个国家应对产能不足的快速办法，这替代了在应对食物危机方面应采取真实的安全政策。
2
Messages and goals of each security protocol are formalized with different set of expression, then most general substitute of the set of expression can be solved by an algorithm.
把每个安全协议的消息和目标分别形式化为表达式集，通过一个算法分别求各表达式集合的最一般代换。
3
Security is a subject that can be taught theoretically, but nothing is a substitute for a real hands-on experience and we've got lots of it.