我们有责任为子孙后代留下一个比我们发现时更好的地球。
The labor which it would require to make a single one of these guns by hand would exhaust the patience and perseverance of any ordinary workman.
"The hardest part of being a machine is pretending to be human."
Science teaches us humility, for every discovery reveals the vastness of our ignorance.
在词语之间的沉默中,真相常常存在。