Question

what is reservoir
please don't answer if I don't know ​

Answer 1

a large lake where water is stored to be used by a particular area, city, etc.

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Answer 2

Explanation:

1.

a large natural or artificial lake used as a source of water supply.

2.

MEDICINE

a population, tissue, etc. which is chronically infested with the causative agent of a disease and can act as a source of further infection.

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