Zhēnzhèng de jiāoqījiāo shì jīng de qǐ shíjiān kǎoyàn de.
A truly inseparable friendship is one that holds up over time.
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Related to the chengyu 如胶似漆 and the classical phrase 胶漆之交 used of Chen Zhong and Lei Yi in 《后汉书》, a byword for loyalty between friends. 胶 and 漆 are both sticky substances that cannot be pulled apart.
