These arrangements tend to be unstable .

这些协定都是不稳定的。

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Unfortunately, cohabiting relationships tend to be unstable.

不幸的是，同居关系趋向于不稳定。

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The vast majority of these G protein-coupled receptors respond to hormones and neurotransmitters. They are not naturally abundant and tend to be structurally unstable.

这类G蛋白偶联受体中的绝大部分对激素和神经递质有反应，它们在自然中并不丰富且在结构上趋于不稳定。

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"Neurotics tend to be unstable, they're insecure, they worry a lot, they're moody -- all these are difficult to deal with, " said Adrian Furnham, a psychology professor at the University College London.

CNN: Study: Neurotics shine over time in team settings