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sid-sess
sid, sess [L] = to sit or settle 坐; 停留
sid, sess
preside
presider
presidium
president
presidency
presidential
reside
resident
residence
session
sessional
possess
possession
possessive
possessor
subside
subsidence
dissident
dissidence
assiduous
assiduity
insidious
insidiousness
assess
assessment
assessor
assessable