This paper gives an emphasis on the study of reservoir rocks, taking a single sand group as a unit;

本文以一个油组为单元，着重对油藏的储层进行研究；

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It can also be used to group physical artifacts together to govern them as a unit; for example, concepts can be versioned.

还可以使用它来将物理构件分组在一起，以将它们作为一个单元来进行治理；例如，可以对概念进行版本控制。

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A message set is a group of messages that need to be treated together as one atomic unit during a reorder operation.

消息集合(Message set)是一组需要在重排操作期间作为一组原始单元处理的消息。

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Unlike other rich countries, Japan does not have a consolidated tax system in which companies in a group are taxed as a single unit.

ECONOMIST: Tax reform runs late

It looks as if it'll sell the unit to a private equity group made up of former executives, but there's a catch--the PE fund wants to leave the pension obligations behind.

FORBES: Magazine Article

He shows us around Ward 53, the psychiatric outpatient unit, where a board lists daily activities such as art and group therapy.

NPR: Chaplain Struggles with PTSD from Time in Iraq