贝尔博士和同事在《自然科学》杂志上透露了他们的发现：1928年至1939年间，三种鱼在每个年龄段的数目均平稳下滑。
As they reveal in Naturwissenschaften, Dr Beare and his colleagues found that populations of all age groups of all three species declined steadily between 1928 and 1939.
滑劈破坏是自然界中客观存在的层状岩石边坡顺层滑坡的一种破坏模式，其特点是滑体上段为剪切下滑，下段被上段推挤后发生倒转破坏。
The slipsplit failure of rock slope parallel to rock layers is a slipping pattern objectively existing in nature characterized by upper part shearing and slipping and lower part overturning.
1959年开始，由于播种面积减少、单产下降、自然灾害等原因，粮食产量连年下滑。
In 1959, various factors such as reduction of sown areas, less yield per unit area and natural disasters contributed to the decrease in grain output.
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