zuànshí

diamond / CL:[[顆|颗<kē>]]

zuānyán

to study meticulously / to delve into

zuàn

an auger / diamond

zuān

to drill / to bore / to get into / to make one's way into / to enter (a hole) / to thread one's way through / to study intensively / to dig into / to curry favor for personal gain

zuàntóu

drill bit

zuānjìn

to get into / to dig into (studies, job etc) / to squeeze into

diànzuàn

electric drill

kāizuān

to start drilling

qūbǐngzuàn

hand drill with a crank handle

qiāodīngzuānjiǎo

to make doubly sure (idiom)