A person used to happiness, will become fragile.

一个人习惯幸福了，就会变得很脆弱。

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When the body gets exhausted the mind can become fragile.

当身体精疲力竭时，精神会变得脆弱。

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Furthermore, with little communication between those couples, their marriages tend to become fragile.

夫妻交流少，婚姻关系脆化等特点。

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There is an understandable fear that some big banks perceived to be weak won't be strengthened sufficiently, because their respective governments would want to avoid the national humiliation of admitting that these flagship institutions have become fragile.

BBC: Eurozone banks to raise more than 100bn euros

And as the divide between the very rich and everyone else increases, political systems become more fragile and less immune to populist insurgencies.

FORBES: America��s Love Affair with Being Middle Class

Their legs are now so long that they have often become too fragile to bear the stress of sprinting and breaks are quite common.

NPR: Heartbreak at the Preakness Stakes