zhè / liǎng / kuài / mù / bǎn / jiē / de / yán / sī / hé / fèng / jī / hū / kàn / bù / chū / jiē / fèng

这两块木板接得严丝合缝，几乎看不出接缝。

The two wooden boards fit together so perfectly that the joint is almost invisible.