英语翻译保函里的内容,This guarantee shall become effective upon receip

英语翻译
保函里的内容,
This guarantee shall become effective upon receipt [of the first installment] of the
advance payment by the Principal.Such guaranteed amount shall be reduced by the
amounts of the advance payment repaid to you,as evidenced by your notices issued
under sub-clause 14.6 of the Conditions of the Contract.Following receipt (from the
Principal) of a copy of each purported notice,we shall promptly notify you of the revised
guaranteed amount accordingly.
Any demand for payment must contain your signature(s) which must be authenticated by
your bankers or by a notary public.The authenticated demand and statement must be
received by us at this office on or before (the date 70 days after the expected expiry of the
Time for Completion) _________________ (the “expiry date”),when this guarantee shall
expire and shall be returned to us.
We have been informed that the Beneficiary may require the Principal to extend this
guarantee if the advance payment has not been repaid by the date 28 days prior to such
expiry date.We undertake to pay you such guaranteed amount upon receipt by us,within
such period 28 days,of your demand in writing and your written statement that the
advance payment has not been repaid and that this guarantee has not been extended.
拜托不要机器译的，我就是很多专业商务词汇不知道怎么译才来求助的~

本保函后生效的第一期收到的
预付款的校长.这样的担保金额应减少了
大量的预付款回报给你,你的通告发布
根据本条14.6%合同条件的.在收到(从
校长)的一份通知,我们每一个自称应及时通知你的
相应的担保金额.
任何要求付款必须包含你的签名(s)必须被验证
你的银行或公证机构.在验证需求及声明都必须是业余选手
在这个办公室的日期当天或之前(70日内期满的预期
竣工时间)_____ _____ _____ __(“到期日”),当此保函
到期,须交还给我们.
我们已经告知受益人可以要求委托人延长
保证如果预付款还未偿还前28天
截止日期.我们保证在收到你们这种担保金额内,由我们
如28天,你的需求,你写的书面声明
预付款还未偿还,这保证没有被扩展.