弱分层虽然也能抑制传热传质，但不稳定、容易被破坏。

Although weak stratification can also prevent heat and mass transfer, it's unstable and easy to be destroyed.

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为解决具有非线性、强耦合和绝对不稳定特点的自平衡两轮机器人的运动控制问题，提出一种分层模糊控制方法。

To the nonlinear, strong-coupling and absolutely unstable characteristics of self-balancing two-wheel robot, a hierarchical fuzzy control method is proposed.

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但在不稳定性心绞痛患者中，基质金属蛋白酶的水平与CD 40l的相关性以及与不稳定性心绞痛患者的危险度分层、发生心脏事件的预测价值方面尚缺乏进一步的探索。

But it is short of further exploration in the correlation between matrix metalloproteinase and CD40L or risk stratification and predicting the value of heart incidence in unstable angina.

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