第二個條件有兩部分。
1. in the custody of any letter or mail carrier,
2。before it has been delivered to the person
所以光是 ”before it has been delivered to the person“ 並不滿足第二個條件。 必須”in the custody of mail carrier“ as well。
如果這兩個condition之間用的是”or“，you are right。
condition之間的逗號=加號（+）。必須加號兩邊的condition同時meet才成立。
