it is a good idea however to request transaction certificates
不过，请求交易证书是个好主意
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It is a good idea, however, to request transaction certificates; and actually many US companies and their certifiers have this as a routine.
然而要求交易证明是一个不错的手段，而且实际上很多美国公司和他们的认证人员以这个作为例行手续。
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