1. 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。

2. It is so in theory , but not in practice.
    理论上是如此，实际上则不然。

3. In theory, that's like using one of your skin cells to clone a new you!
    理论上说，这就像是用你的一个皮肤细胞来克隆一个新的你。

4. From time to time, according to his theory, passing ships and planes set off the crystal, which confuses their instruments and sucks them into the ocean.
    按照他的理论，过往的船只或飞机时不时会触动那块水晶，于是它会干扰它们的仪器，把它们吸入海底。