介绍:
Banned chemicals persist in deep ocean
Chemicals banned in the 1970s have been found in the deepest reaches of the ocean, according to a new study.
Scientists were surprised by the relatively high concentrations of pollutants like PCBs and PBDEs in deep sea ecosystems.
concentration /‘kɑnsn’treʃən/ n. 专心，集中 - 四级
ecosystem /‘ɛko,sɪstəm/ n. 生态系统
Used widely during much of the 20th Century, these chemicals were later found to be toxic and to build up in the environment.
The results are published in the journal Nature Ecology and Evolution.
ecology /ɪ’kɑlədʒi/ n. 生态学 - 六级
evolution /ˌivə’luʃən/ n. 演变，进化 - 四级
The team led by Dr Alan Jamieson at the University of Newcastle sampled levels of pollutants in the fatty tissue of amphipods from deep below the Pacific Ocean surface.
The animals were retrieved using specially designed "lander" vehicles deployed from a boat over the Mariana and Kermadec trenches, which are over 10km deep and separated from each other by 7,000km.
sample /‘sæmpl/ v. 抽样 - 四级
amphipod /ˈæmfəˌpɑd/ n. 片脚类动物
retrieve /rɪ’triv/ v. 寻回，找回 - 雅思
trench /trɛntʃ/ n. 沟，战壕 - 六级
