VOA慢速英语:阿拉斯加的鲑鱼变小了

species– n. biology : a group of animals or plants that are similar and can produce young animals or plants : a group of related animals or plants that is smaller than a genus

journal – n. a magazine that reports on things of special interest to a particular group of people

mature – v. to become mature: such as to become fully developed in the body and mind

indigenous – adj. produced, living, or existing naturally in a particular region or environment (indigenous people are ethnic groups who are the earliest known people in an area)

manage – v. to control the movements or actions of (something); to use (something) carefully and without waste