A major concern is to alleviate environmental pollution and restrict the deteriorative tendency the 21 st century.进入21世纪以来,减轻环境污染和遏制生态恶化趋势已成为人们关注的焦点....

变坏的，恶化的...

deteriorative的音标：deteriorative的英式发音音标为：[dɪ'tɪərɪəreɪtɪv]deteriorative的美式发音音标为：[dɪ'tɪərɪəretɪv]...