By Janet Barrie, BBC News

媒體英語會帶大家一起學習 BBC 撰稿人在報道世界大事時常用到的單詞和短語。

Background: 科學家近日報告說，排入海洋中的化石燃料氣體會使海水酸化，由此可導致海洋中的魚類失去聽力，并會給眾多海洋生物的未來帶來毀滅性的破壞。

Spectacular tropical clownfish who live around ocean coral reefs rely heavily on their hearing, say scientists. It helps them find a mate, forage for food, and crucially avoid predators lurking in the depths.

Scientists from the University of Bristol in England bred baby clownfish then exposed different groups of them to different levels of carbon dioxide in the water around them -- one at today's levels, and the others at the levels the world's oceans are predicted to reach by 2050 and the year 2100.

They tested their hearing by piping into each tank the sounds of the coral reef -- those in today's conditions swam away from the noise of predators. Those in the mocked-up waters of the future showed no response, suggesting they couldn't hear.

Scientists say the more carbon dioxide we emit, the more oceans absorb and the more acidic the water becomes, and that has potentially devastating consequences for fish. What they don't know though is whether fish will be able to adapt and tolerate the changing waters.