They retrofitted the plane with improved seating.

他们在飞机上安装了经过改良的座椅。

Voice recorders were retrofitted into planes already in service.

录音设备安在了正在服役的飞机上。

It may need to be retrofitted.

屋顶可能需要翻新。

Security that is retrofitted is usually woefully inadequate.

对安全功能进行翻新改造通常都是达不到目的的。

The MTI control can also be retrofitted to an existing machine.

MT I数控系统也可以用于改造现有机床。