1. There is not an atom of water.
    一滴水都没有。

2. A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
    水分子含有两个氢原子和一个氧原子.

3. Like the Theory of Relativity, the splitting of the atom, and the first space flight, Dolly's appearance has generated a long list of difficult puzzles for scientists, politicians, and philosophers.
    就像相对论、原子裂变和第一次太空飞行一样，多莉的出现给科学家、政治家和哲学家们提出了一长串难以解答的难题。