2.他那富有感染力的笑声打破了沉寂。
His laughter, which was infectious, broke the silence.

3. 理论之所以有价值，是因为它能给实践指出方向。
Theory is valuable because it can provide a direction for practice.

4. 农村改革中的好多东西，都是基层创造出来的。
Many of the good ideas in rural reform came from people at the grass roots.

5. 搞好社会治安，是关系到人民群众生命财产安全和改革、发展、稳定的大事。
Sound public security is of prime important for the safety of people’s lives and property as well as the reform, development and stability.

6. In that infinitesimal fraction of time, inconceivable and immeasurable, during which the first atomic bomb converted a small part of its matter into the greatest burst of energy released on earth up to that time, Prometheus has broken his bonds and brought a new fire down to earth, a fire three million times more powerful than the original fire he snatched from the gods for the benefit of man some five hundred thousands years ago.（英译汉）
在这难以想象，无法计算的刹那之间，普罗米修斯挣脱了身上的锁链，又把新的火种送到了人间。这时第一颗原子弹把它的物质的一小部分化为地球上迄今所能释放出来的最大能量。这个新火种与大约50万年前普罗米修斯为了造福人类从天庭盗走的旧火种相比，其威力要大300万倍。