At the summit, the royal palace was protected by a defensive wall running along its perimeter.

山顶的王宫被四周的一圈防御城墙保护着。

Most Greek city-states surrounded themselves with massive defensive walls for added protection.

大多数希腊城邦都用巨大的防御墙包围自己以增加保护。

The Romans built a defensive wall around the city.

【around】罗马人在城的四周筑起城墙。

The city had three defensive walls and contained numerous fortresses at its  corners.

这座城市有三道防御墙，角落里有许多堡垒。

When Sargon originally conquered the city-states, he ordered their defensive walls to be destroyed.

当萨尔贡最初征服城邦时，他下令摧毁他们的防御城墙。

But hypochlorous acid is neutral, so it's able to slip right past the defensive wall and start messing with the proteins inside, or even start breaking the wall itself.

但是次氯酸是中性的，所以它能够滑过防御墙，开始扰乱里面的蛋白质，甚至开始打破墙本身。

The street was named for a defensive wall built in 1653 that was removed less than 50 years later, yet somehow that legacy still lasts.

这条街以 1653 年修建的防御墙命名，该墙在不到 50 年后被拆除，但不知何故，这一遗产仍然存在。

But hypochlorous acid is neutral, so it’s able to slip right past the defensive wall and start messing with the proteins inside, or even start breaking the wall itself.

但是次氯酸是中性的，所以它能够直接穿过防御墙并开始扰乱里面的蛋白质， 甚至开始破坏防御墙本身。

From the remains of its Roman Amphitheater to the almost complete defensive walls that encircle the city and let's not forget the beautiful central streets with some magnificent architecture.

从罗马圆形剧场的遗迹到环绕城市的几乎完整的防御墙，我们不要忘记美丽的中央街道和一些宏伟的建筑。