And it's really rare to hear anyone making a calculation based on a single datum.

而且很少听到有人根据单一数据进行计算。

Sometimes, it is true, she tried to make a calculation, but she discovered things so exorbitant that she could not believe them possible. Then she recommenced, soon got confused, gave it all up, and thought no more about it.

其实，她有时也想算计算计，但是一算就发现事情越出常轨，连她自己也难以相信。 于是她又重新算过，可是越算越糊涂，只好丢下不管，甚至想也懒得想了。