他们偶然发现一种稀有金属铱的含量在边界处突然变得很丰富，然后又慢慢地消失了。
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
一日子，当步行的时候完成的森林，和他们偶然发现一只金的青蛙了。
One day, while walking through the woods, and they came across a golden frog.
他们偶然发现了这个班级一个共同的特征：让事情尽量简单，然后再完善它。
They had stumbled upon one of the themes of the class: make things simple, and perfect them later.
应用推荐