求翻译：买房须于本合同签字并生效后30天内通过出口地银行开立以卖方为受益人的不可撤销信用证支付全部货款计30,000美元是什么意思？

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Buying a house is required to include in this signature and entry into force of the contract within 30 days after the adoption of the country of export bank to open up to the seller to beneficiaries of an irrevocable letter of credit for the payment of all money of $30,000

Purchases homes must sign in this contract and become effective in latter 30 day to draw up through the exportation bank take the seller cannot abolish the letter of credit as the beneficiary to pay lends completely counts 30,000 US dollars

Buyers are required to sign the contract and within 30 days after the effective date through the export Bank to open an irrevocable letter of credit in favor of the seller to pay the full price of USD 30,000

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