fictitious molecular weight

例句：

1. 1. The story is so far-fetched that it's hard to believe.
   这个故事太离奇了，难以置信。
2. 2. The painting is fictitious and does not represent any real person or event.
   这幅画是虚构的，不代表任何真实人物或事件。
3. 3. The scientist made many fictitious calculations in his research.
   这位科学家在他的研究中做了许多虚构的计算。