無師自通

self-taught / to learn without a teacher (idiom)

self / oneself / from / since / naturally / surely

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

not to have / no / none / not / to lack / un- / -less

surname Shi

teacher / master / expert / model / army division / (old) troops / to dispatch troops