sight demand credit
即期付款信用证
以上为机器翻译结果，长、整句建议使用 人工翻译 。
M: Some customers demand that 80% of the credit amount be paid at sight, and the rest be paid after the machines are proved satisfactory on trial.
M：有的客户要求80%的款项即期支付，余款待机器运到验收合格后再支付。
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