Luckily, there was a guard on duty.
幸运的是，有一个保安在值班。
There must be a guard on duty somewhere. Let's go find him.
一定有警卫在哪个地方值班。我们去找他。
Before long a security guard on patrol duty sees him.
不一会儿，一位巡逻的保安看到了他。
Like a sentinel on guard duty, or an artist working with his paints.
就像哨兵要时刻监守自己的岗位，画家要专心做画一样。
At the gate of a university a security guard is standing on duty.
在一所大学门口，一名保安正在执勤。
At the gate of a university a security guard is standing on duty.
在一所大学门口，一名保安正在执勤。
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