融會貫通

to master the subject via a comprehensive study of surrounding areas

to melt / to thaw / to blend / to merge / to be in harmony

old variant of 融[rong2]

to blend / to integrate / to amalgamate / to fuse

can (i.e. have the skill, know how to) / likely to / sure to / to meet / to get together / meeting / gathering / union / group / association / a moment (Taiwan pr. for this sense is [hui3])

to balance an account / accountancy / accounting

to balance an account / accounting / accountant

to pierce through / to pass through / to be stringed together / string of 1000 cash

to link up / to thread together

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)