unassignable letter of credit

例句：

1. 1. The contract stipulates that the goods must be unassignable.
   合同规定货物必须不可转让。
2. 2. This type of currency is considered unassignable due to its rarity.
   这种货币因其稀有性被认为是不可转让的。
3. 3. The company's policy prohibits the assignment of shares in any event.
   公司的政策在任何情况下都禁止股份转让。