1. I imagine another possibility. I am walking with my gun in my hand when I hear the voice. The man mustn't have seen my gun.
    我的朋友便不由自主地锁上了车门。

2. Imagine people trying to make a living at this job.
    想想那些试图以此为生的人吧。

3. Imagine a small plastic card that holds all manner of information about you on a tiny memory chip (芯片):
    设想一下一张小小的塑料卡，在微小的记忆芯片上存有关于你的所有信息：