数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。

Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.

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一次一对一网上数学辅导课的尝试，给汉森女士留下了深刻印象。

Ms Hanson was impressed by an experiment with online, one-on-one maths tutoring.

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利用数学方法揭示了网壳结构失稳的本质。

The essential of the instability is showed by mathematics method.

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