a lie detector的用法和样例：
- Do you think it is ok to use a lie detector?
- A debate over this began in 1966 when a lie detector expert, Cleve Backster, connected a plant to a polygraph (lie detector).
- An Australian radio show has been pulled off air after a lie detector stunt saw a 14-year-old girl say she had been raped.
- He tried to varnish over the truth with a lie.
- He is so naive as to believe such a lie.