为了避免匈奴人的入侵，他下沿着整个国 家的北部边界建立新的城墙，以连接残留的防御工事。
To protect the empire against intrusions by the Xiongnu people from the north, he ordered the building of a new wall to connect the remaining fortifications along the empire's new northern frontier.
匈奴人：一个游牧民族的成员，该民族公元4至5世纪入侵欧洲，455年被打败。
A member of a nomadic pastoralist people who invaded Europe in the fourth and fifth centuries a. d. and were defeated in 455.
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