irrigationn.
美 ˌɪrɪˈɡeʃn
中文n. 灌溉；[临床] 冲洗；冲洗法
词根词源
irrigation (n.)"a supplying of water to land," 1610s, from Latin irrigationem (nominative irrigatio) "a watering," noun of action from past participle stem of irrigare (see irrigate).
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