必须紧密协作
Close collaboration is necessary.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
这就意味着测试人员必须和开发人员至少要紧密协作到把原因搞清楚为止。
This means that the test team will have to work closely with the development engineers at least till the cause is identified and isolated.
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