新技术应该提供一个安全的防火墙以防御黑客。
New technology should provide a secure firewall against hackers.
坚固的防御系统提供保护以防备敌人的突袭。
A strong defence system offers protection from sudden attack by the enemy.
人们从前在城镇四周筑坚固城墙以防御敌人。
People used to build strong walls round their towns as a defense against enemies.
他们可以防御如果挑战，因为他们是他们的想法。
They can be defensive if challenged, because they are their thoughts.
他们可以防御如果挑战，因为他们是他们的想法。
They can be defensive if challenged, because they are their thoughts.
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