Given curiosity's complexity, scientists have found it hard to define.
考虑到好奇的复杂性，科学家们发现很难定义它。
Scientists say the compound is likely to cause cancer but have no hard scientific proof.
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。
But initially it was hard to persuade Chinese scientists to accept this.
但一开始，很难说服中国科学家接受这一点。
The scientists have been working hard to find ways to save oil and electricity.
科学家们一直努力工作，要找到节省油和电的方法。
Can scientists help the hard of hearing to hear better?
科学家能帮助重听者听得更清楚一点吗？
Scientists are working hard to send astronauts onto the moon again.
科学家们正努力再次把宇航员们送上月球。
Scientists are working hard to the dream.
科学家正在努力工作使得这个梦想成真。
Scientists are working hard to find ways to keep the earth clean.
科学家们正致力于找到保持地球清洁的办法。
Scientists are working hard to find ways to keep the earth clean.
科学家们正致力于找到保持地球清洁的办法。
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