In ... vein, 以....心情,方式...

spoke later in a more serious vein.

后来以一种更严肃的心境讲话

 

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in a ... vein

in a particular style of speaking or writing about something

in the same vein/in a similar vein

There was more humour, in much the same vein.

in a serious/light-hearted etc vein

poems in a lighter vein

 

In this vein, all pools of capital that depend on the smooth functioning of the financial system and are large enough to be a burden on it in a crisis should be subject to some degree of regulation.

 在这种情况下，所有依赖于金融体系平稳运转、并且规模大到足以在危机中拖累该体系的资本池，都应当接受某种程度的监管。