“Payment will be paid by T/T sight before shipment”是什么意思?

Payment will be paid by T/T sight before shipment. “Payment will be paid by T/T sight before shipment”是什么意思? Payment terms: By L/C at sight or T/T advance是什么意思? 英语翻译Payment to be paid by an irrevocable confirmed at Sight 50% deposit,balance by T/T before shipment Payment will be through L/C sight这是什么意思 30% Deposit by T/T,the balance paid by L/C at sight payment by t/t.full amount paid against the presentation of "payment upon shipment"是什么意思? 30% down payment with the balance to be paid on receipt of t balance T/T payment before delivery,EN-71 cost collect by T/T, L/C at sight 的 at sight 是什么意思?