simjang naemak
endocardium
endocarde
심장 내막은 심장의 내부를 덮고 있는 얇은 막입니다.
simjang naemak-eun simjang-ui naebu-reul deopgo itneun yalbeun mak-imnida.
The endocardium is a thin membrane that covers the interior of the heart.
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