他有一名律师，可是，所有精心布置的证据和关键的证人，都无懈可击。
He has a lawyer, but, the evidence painstakingly arranged and the key witness are all unassailable.
预计他将成为审判时的关键证人。
正当调查人员们将调查范围扩大到后来的这些袭击事件时，人们对调查小组的信任却下降了。 因为此时关键证人暗示叙利亚显然是编造了证词。
Even as the investigators’ brief widened to include these later attacks, their credibility fell when it emerged that key witnesses implicating Syria had apparently made up their testimony.
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