去年，经济增长率逐渐降到了4%以下。
Last year, economic growth tailed off to below four percent.
由于在苯胺降解过程中产生了有毒物质，因此苯胺降解率逐渐降低。
Because virose matters were produced during aniline degradation, aniline degradation rate descended gradually.
随着感染时间的不断延长，活性氧的产生速率逐渐降低，同时光合作用逐渐减弱。
With lastingness of infection, the productive rate of reactive oxygen species decreased gradually, and photosynthesis also weakened.
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