科学家们普遍认为，我们正在经历的变暖至少在某种程度上是由人为引起的全球变暖导致的结果。
Scientists are in general agreement that the warmer conditions we have been experiencing are at least in part the result of a human-induced global warming trend.
后来，他又担心是布卡武的其它某种病菌导致初始检测出现阳性结果。
He then worried that some other bug in Bukavu could have been causing the initial tests to give a positive reading.
这一观点是实际的，因为当系统处于某种意外的状态下(会导致某种非期望的结果)时系统缺陷会出现。
This perspective is practical because a system defect arises when the system is in some unexpected state that in turn causes some undesired outcome.
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