The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards - and even then I have my doubts.

小说是一面照向社会的镜子，反映了它的缺陷和美丽。

We stand at the threshold of a new era in biology.

成功的投资在于有纪律地坚持一个经过深思熟虑的计划。