在里约热内卢起飞之前的几个小时之内，飞机没有任何机械故障的迹象。
In the hours before the flight took off from Rio DE Janeiro, there were no signs of mechanical trouble.
当出现故障的迹象时，自动地调用调试器。
At the first sign of a failure, the debugger is automatically invoked.
当他的汽车开始出现故障的迹象时，他会查看故障，通常自己就把车修好了。
When his car begins to show signs of trouble, he'll dig into the problem and usually fix it on his own.
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