bulwark（n）壁垒（尤指泥土堆砌者），防御工事；（比喻）支持，防御或保护的人和事物
Democracy is a bulwark of freedom。
民主是自由的保障。
The bulwark against populism could buckle if there is yet another round of brinkmanship and bargaining.
假如还有另外一轮的边缘政策和谈判，反对民粹主义的堡垒可能会被压碎。
The US must offer to assist this healing process and bolster democracy in Pakistan as the best bulwark against terrorists.
美国必须辅助这个恢复进程，鼓励巴基斯坦的民主，以此作为对抗恐怖主义的最佳防波堤。
And if we expect the IAEA to be a bulwark of the nonproliferation regime, we must give it the resources necessary to do the job.
如果我们期望国际原子能机构成为不扩散体制的一个堡垒，我们就必须让它获得做好这项工作的必要资源。
safeguard（n） ～ against sb/sth 安全措施，保护性措施
We will introduce legal safeguard against fraud。
我们为制止诈骗活动要采取法律保护措施。
Safeguard your passwords and change them frequently.
经常保护和更改你的密码。
But I doubt whether any of this will be enough to safeguard our freedom.
即使如此，我还是怀疑这一切就真的足以保障我们的自由。
It reinforces the resolve of its neighbors to intensify their cooperation to safeguard peace and stability in the region against all provocations.
这种行为增强了其邻国为维护地区和平与稳定及防范一切挑衅行为进行合作的决心。