请教：国贸的英语术语翻译

Question

lAccording to the terms agreed upon, we have drawn on you at sight against shipment through Bank of China here. We would ask you to protect the draft upon presentation.
其中的draw on, at sight, protect, the draft upon presentation分别是什么意思呀？
我是初学者，望不吝指教！

Answer 1

draw on sb.是以某人为受益人开立（信用证）
at sight是指即期（信用证）
protect the draft upon presentation 指提示票据后请保存好单据。

Answer 2

我们根据双方已商定条款，在中国银行开立了以你方为受益人的信用证，我们希望你房能妥善保管好单据。