The procurement form USES another previously unused input control, the text box.

采购表单使用到了先前还未用过的输入控件，即文本框。

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You may also discover that you simply need to start using previously unused features in your existing toolset.

您也许还发现您只需要开始使用现有工具集中以前未用的特性。

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What if you were able to tap the latent interests, experience, education and skills in your workforce and apply them in ways previously unused?

FORBES: No Career Path, No Retention

The Capitol, a replica of the one in Washington, was previously the seat of government in Cuba but has mainly sat unused since the 1959 revolution.

CNN: Cuban President Raul Castro says he'll leave in 2018