annually decreasing tendency 逐年下降趋势
Total Fe and free Fe contents also showed a decreasing tendency.
全铁和游离铁的含量也呈下降趋势。
The morbidity and mortality of the whole city also appeared a decreasing tendency.
全市的发病率及死亡率也有明显下降。
Precipitation in other seasons showed a decreasing tendency except winter, and the most obvious reduction happened in autumn.
除冬季外其余各季节的降水量均呈减少趋势，秋季减少最明显。
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