She had always kept the family at arm's length.

她一直和家人保持一定距离。

I held it at arm's length.

我伸直胳膊提着它。

He keeps all his clients at arm's length.

他不与任何委托人过分亲密。

He struck a match, and held it at arm's length.

他划了根火柴，然后伸长胳膊举着。

If an interactive computer screen is to match a whiteboard in usefulness, it must be viewable from arm's length as well as from across a room.

如果一个交互式计算机屏幕要在实用性上与白板相匹配，它必须在手臂长度范围和横跨房间范围内是可视的。