Originally hailed as a " ray gun " , it proves impractical as a weapon .
这种最初被称作“光枪”的的东西证明是一种不切实际的武器。
For example , you might use a cylinder instead of a narrow ray to make picking points easier .
例如,你可能想使用柱形代替窄窄的射线以使得指定拣选点更为容易。
If it takes three minutes to x - ray a suitcase , then it takes three minutes whether it is done an hour before a flight is supposed to leave or three hours later .