(1)心臓の1拍ごとの動脈のリズミカルな収縮・膨張
(2)the rhythmic contraction and expansion of the arteries with each beat of the heart; "he could feel the beat of her heart"
さらに詳しく
(1)移植のために器官を提供する人
(2)someone from whom an organ is taken for transplantation
