求翻译：He interviewed the first witness almost at once, making sure everything was done that could be done to put him at ease. However, the witness was obviously nervous and Burton took great pains to go over what he said thoroughly, choosing and checking each word carefully and taking the man’s statement down himself. The witness had called the police and he’d waited until the ambulance began to arrive, then, when the first police car arrived at the scene he’d been asked to report to the station, which was what he had done.是什么意思？

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