拼音：liǎng rèn xiāng gē，lì dùn nǎi zhī
注音：ㄌㄧㄤˇㄖㄣˋㄒㄧㄤㄉㄨㄣˋㄋㄞˇㄓ
解释：利：锋利；乃：才。两把刀子交锋之后，才能知道哪把快哪把钝。比喻只有把两种学说、观点放在一起比较，才能判定是非曲直。
出处：汉·王充《论衡·案书》：“两刃相割，利钝乃知；二论相定，是非乃见。”
Advantage: sharp; Nai: talent. Only after the two knives meet can we know which is fast and which is dull. Only by comparing the two theories and viewpoints together can we judge the right and wrong.
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