application for letter of credit

例句：

1. 1.We need to apply for a letter of credit before we can proceed with the purchase.
   在购买之前，我们需要申请信用证。
2. 2.The company has applied for a letter of credit for the import of machinery.
   该公司已经为进口机器申请了信用证。
3. 3. The exporter must provide a detailed application for letter of credit before the goods are shipped.
   出口商必须在货物装运前提供详细的信用证申请。