They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
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。
This can be very handy for those times when you close your chat window accidentally and want to read the last few lines again.
当您不小心关闭聊天窗口，但又想阅读刚聊过的最后几行时，该特性十分方便。
Proper calculations of sine and other functions that are both accurate and fast require very careful algorithms designed to avoid accidentally turning small errors into large ones.
要准确快速地计算正弦函数和其他函数，需要非常仔细的算法，专门用于避免无意地将小的误差变成大的错误。
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