Are the guests asked me to write a letter of guarantee to him.

现客人要求我写一个保证函给他。

We will instruct the Bank of China to issue a Letter of Guarantee.

我们将通知中国银行开出保证书。

Secondly, I probe into the theory of the letter of guarantee and its practical usage.

本文第二部分则对海运保函的理论及在海运实践中运用进行了一些探讨。

The letter of guarantee in the contract before the expiry of the warranty in full force and effect.

本保证函在本合同规定的质保期满前完全有效。

After shipping company's signing, please return to us accompany with the original Letter of Guarantee.

船公司签收后，请并附原保证函，寄回本行。