投标必须立即用信件或通过电传、电报或传真的签署副本加以确认。
The tender must be confirmed promptly by letter or by the despatch of a signed copy of the telex, telegram or facsimile.
最好用蓝墨水而不是用黑墨水来签署合同，因为蓝墨水可以很容易地让人区别出哪个是合同正本，哪个是影印副本。
Sign the contract in blue ink, not black ink. This, too, will make it easier to differentiate the signed original contract from photocopies.
雇主必须签署合同副本。
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