Zhè zuò diāosù níngjié le yìshùjiā duōnián de xīnxuè.
This sculpture is the crystallization of years of the artist's effort.
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凝结 has both a physical meaning (condensation/solidification) and a figurative one (to crystallize effort, wisdom, or emotions). 凝结了心血 means 'represents the crystallization of painstaking effort'.
