The entry for 'polygraph' is cross-referred to the entry for 'lie detector'.
词条polygraph下注有指向词条lie detector的参照项。
《牛津词典》
2
By the way, this minus sign here is actually related to the way in which, when we do a cross product, we have a minus sign for the second entry.
顺便说一下，这里这个-号实际上和，我们做交叉乘积的时候的方法是有联系的，我们在算第二项前面是-号。
3
The condition first came to the attention of the medical community when a Swiss woman tried to cross the border into the United States, which requires non-citizens to be fingerprinted upon entry.