Luck would have it that Fleming had decided not to store his culture in a warm incubator, and that London was then hit by a cold spell, giving the mold a chance to grow.

• 彷佛是幸运之神的眷顾，佛莱明决定不要把培养菌放在温暖的培养器中，然后冷峰侵袭了伦敦，给了霉菌生长的机会。