只有为别人而活，生命才有价值。
The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.
The strongest people are those who have been through the most.
心灵是一个不断展开的过程。
The future of coal depends on balancing economic growth with environmental responsibility.