The journey of scientific discovery is filled with challenges, but it is also incredibly rewarding.

计算安全不仅仅是建立防护墙，而是要理解威胁的全貌。

The challenge for modern states is to maintain their legitimacy while also being effective in providing services and maintaining order.

The only way to do great work is to love what you do.

If you lose or forget to bring a cable，adapter or charger，check with your hotel. Most hotels now have a drawer full of cables，adapters and chargers others have left behind，and probably have the one you are missing. You can often claim it after borrowing it.