Nelson irrigation corporation is headquartered in walla walla , washington , usa 描述:美国耐尔森灌溉公司是美国华盛顿在该领域名列前茅的企业。
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Poking around in a canyon in the walla walla valley of eastern washington , he found 39 stacked layers of sediment deposited by water 他在华盛顿州东部瓦拉瓦拉谷的一个大峡谷中四处探访，发现了洪水沉淀物形成的39个堆积层。
