世界各国的科学家正在寻找防止禽流感病毒传播的途径。
Scientists worldwide are trying to find a way to prevent transmission of the virus.
由于人们对空气污染和原油储量减少现状的认识，世界各国的科学家试图寻找燃油发动机的替代物。
Recently more and more concern over air-pollution and decrease of oil reserves has forced scientists of many nations to seek alternatives to the internal combustion engine powered automobiles.
麦克基本说，科学家的数据已经不断证实这一威胁，可是世界各国领导人却仍然拿不出来一个应对挑战的计划。
McKibben says the threat is confirmed, continually, by scientific data, yet world leaders have yet to produce an effective plan to meet the challenge.
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