Example
yì一kāi shǐ开始fǎ yī法医tuán duì团队yǐ wéi以为tā men他们fā xiàn发现le了rén人xuè血，dàn但hòu lái后来cái才zài在shí yàn shì实验室lǐ里fā xiàn发现zhè这yuán lái原来shì是niú牛xuè血。
一开始法医团队以为他们发现了人血，但后来才在实验室里发现这原来是牛血。
At first the forensics team thought that they'd discovered human blood, only to find out later, at the lab, that it was bovine.