开车走了几公里后，萨姆来到一个有停车标志的十字路口。
After a few kilometres, Sam came to an intersection with a stop sign.
这是一个人在其身份被改变后的标志。
维修完毕后清理现场、收回安全标志牌。
After repair, clean up the site and recover the safety signs.
然而，更准确的进度标志应该是运行测试后的代码。
However, a more accurate timed progress marker is running tested code.
另外一个标志是在少量活动如爬楼梯一后呼吸困难。
Another sign is difficulty breathing after minor activity like walking up stairs.
另外一个标志是在少量活动如爬楼梯一后呼吸困难。
Another sign is difficulty breathing after minor activity like walking up stairs.
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