The hills lie about the valley like a protective wall.

群山环抱着峡谷，犹如一堵护卫墙。

youdao

The user identity authentication is the first protective wall of network and information security.

用户身份认证是网络安全和信息安全的第一道屏障。

youdao

"Even if we have the protective wall against the tsunami, it is meaningless," he says.

他说：“即使我们有对抗海啸的防护堤，也毫无意义。”

youdao

"Even if we have the protective wall against the tsunami, it is meaningless," he says.

他说：“即使我们有对抗海啸的防护堤，也毫无意义。”

youdao