VOA慢速英语:在美国被遗忘的鲟鱼归来

armor plate – n. bony pieces along its back for protection

stream – n. a natural flow of water that is smaller than a river

ecologist – n. a scientist that deals with the relationship between groups of living things and their environments

frankly – adv. in an honest and direct way

propeller – n. a device with two or more blades that turn quickly and cause a ship or aircraft to move

massacre – n. the violent killing of many people or living beings

buffalo – n. a large member of the Bovidae family