搪瓷茶杯如果长期沉积茶垢，通常不易洗去。
富有机质黑色页岩的形成长期以来被认为是缺氧沉积环境的证据，并被作为全球缺氧事件的标志。
Black shales have been considered as a sign of anoxic depositional environments and anoxic events for a long time.
长期以来，云南易门铜矿区中的狮山和凤山铜矿床被认为是陆源沉积变质成因。
The Shishan and Fengshan deposits, two main ore deposits in the Yimen copper ore district, were long considered to be of terrigenous metamorphosed sedimentary origin.
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