Now, eight major DAMS on the Snake and Columbia Rivers have exacted a toll on the fish in their 900-mile journey to the sea-one of the greatest migrations in nature.
如今，蛇河和哥伦比亚河上八个主要的大坝对这些鱼洄游到大海的900英里行程造成了巨大破坏——这是自然界最伟大的洄游之一。
Trimethylamine (TMA) gas is the main gas come from deterioration of fish and one of the major odor gases existing in urban sewer.
三甲胺(TMA)气体是鱼类水产品变质后释放的主要气体，也是城市下水道释放的主要恶臭气体之一。
Trimethylamine (TMA) gas is the one of major odor gases existing in urban sewer. Recent researches in TMA gas sensor focus on inspecting freshness of fish.
三甲胺（TMA）气体是主要的城市下水管道恶臭物质之一，目前对三甲胺气敏材料的研究主要集中在鱼鲜度的测定。
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