科学家们称这种化合物可能致癌，但是并没有确凿的科学依据。
Scientists say the compound is likely to cause cancer but have no hard scientific proof.
科学家确定一种可能成为治疗血吸虫的新方法的化合物。
Scientists have identified a compound that could become a new treatment for schistosomiasis.
现在，考古学家断定这些建筑物是在几百年间陆续建成的。
Until now, archaeologists had assumed that these were built over the course of centuries.
化学家设法分离出了这种化合物。
科学家们推定这些蛋白聚集物对神经细胞是有毒性的。
Scientists assume that these protein aggregations are toxic for nerve cells.
科学家们试图研发出这些化学物质的拮抗物，但成效并不大。
Scientists have tried to develop antagonists to those chemicals, without much success.
直到现在，甚至科学家也不确信是否有不明飞行物。
Until now, even the scientists are not sure whether there are UFO.
毫无疑问，功能配合物的研究已经成为化学家研究的热点之一。
Undoubtedly, the research on functional complexes has been one of the hot topics.
科学家必须决定如何接触到的污染物是有害的。
Scientists must then determine how much exposure to pollutants is harmful.
科学家必须决定如何接触到的污染物是有害的。
Scientists must then determine how much exposure to pollutants is harmful.
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