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
However, requiring transaction proof is a good approach, and in fact, many American companies and their certification personnel use this as a routine procedure
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
It is a good idea, however, to request transaction certificates; and actually many US companies and their certifiers have this as a routine.
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