Food production is likely to be severely affected by a decrease in suitable farm land and decrease in the length of growing seasons.

由于合适的耕种地减少以及生长季节的减短，粮食生产有可能严重受到影响。

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It proved effective that the ant colony algorithm can improve the optimal design. As a result, the weight of the mid ship section structure in unit length may decrease by 3.35%.

改进的蚁群算法对该模型进行优化计算，该船的中剖面纵向结构单位长度的重量减轻3.35%，结果表明蚁群算法是行之有效的。

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