af·fu·sion /æˈfjuʒən/
注水
Af·fu·sion n. The act of pouring upon, or sprinkling with a liquid, as water upon a child in baptism. Specifically: Med The act of pouring water or other fluid on the whole or a part of the body, as a remedy in disease. [archaic] --AS
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affusion
n : the act of baptizing someone by pouring water on their head