file - realm - demo：展示如何使用用户和组的平面文件设置安全约束。

File-realm-demo: Demonstrates how to setup security restrictions using a flat file of users and groups.

youdao

第二十七条铁路与道路平面交叉的道口，应当设置警示灯、警示标志或者安全防护设施。

Article 27 warning lights, warning marks or safety protection facilities shall be set up at a crossing where a railway and a road intersects on a plane.

youdao

新的安全水平比地平面灰尘背景水平高出一百倍，也比从火山爆发以来测试飞机在英国上空所测的数据要高很多。

The new safety level is about 100 times higher than the background level of dust at ground level.

youdao