You need an official signature to validate the order.

你要有正式的签字，这张汇票才能生效。

Here's an example of such a scam using official-looking Bank letterhead and signature.

现举例说明使用看上去正式的世行信笺和签名的诈骗案件。

With a squiggle of Laura Bo's pen - her signature was usually unreadable - she could make the check official.

劳拉·波只要大笔一挥——她的签字往往是难以辨认的——就可以使这张支票生效。

With a squiggle of Laura Bo's penDher signature was usually unreadableDshe could make the check official.

劳拉?波只要大笔一挥――她的签字往往是难以辨认的――就可以使这张支票生效。

Although FECDB takes no official stance in these Petition drives, members often organize letter-write campaigns as well as signature gathering drives to voice their opinions.

虽然本教会在签名请愿不采取正式姿态，但会员亦经常组织向议员发信，并以签名提案发表他们的立埸。