Built to withstand the attack of small armies such as swords and spears, these walls were made mostly by stamping earth and gravel between board frames.
为了抵御小型兵器的袭击，例如剑、矛，城墙大多由版筑(在夹板中填入泥土和碎石)而成。
The Spanish again strengthened the fort after the British attack. This time they made a wall of earth around Saint Augustine to protect the town.
在这次英国的进攻之后，西班牙人再次加固了这座城堡，这次他们在圣奥古斯丁四周建起了城墙以保护这座城市，他们还改进了城堡中的防御工事。
Why on earth should we believe an attack by someone who's unwilling to stand behind his or her own words?
我们究竟为什么要相信一个敢说不敢认的人对他人的攻击之词呢？
In this present day prequel, the robot invaders attack the Earth, forcing a small band of humans to seek refuge below the surface of the planet.
简介在这部前传中，机器人入侵者袭击地球，一小队人被迫躲到地表以下寻求避难。
Trees receive fewer nutrients from the earth because it is so acid, and this creates forests that are more vulnerable to drought, disease and insect attack.
因为它是酸值很高，树木获得来自土壤的养分就会减少，森林也变得更容易受到干旱和病虫害袭击。
Trees receive fewer nutrients from the earth because it is so acid, and this creates forests that are more vulnerable to drought, disease and insect attack.
因为它是酸值很高，树木获得来自土壤的养分就会减少，森林也变得更容易受到干旱和病虫害袭击。
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