密码学是关于在存在对手的情况下进行通信的。
The future of grain production lies in sustainable practices that respect both the land and the people who work it.
我把声音留给了舞台。在现实生活中我不怎么说话。
Be scrupulously truthful, even when truth is inconvenient, for it is more inconvenient when you try to conceal it.