The meetings will be held on an ad hoc basis.

会议将根据需要随时举行。

"I would accept opportunities in TV on an ad hoc basis," he said.

“在特别需要时我会接受在电视上露面的机会，”他说道。

Object definitions are quite AD hoc.

对象定义非常特别。

It was a "piecemeal, AD hoc" approach, he said.

这是一种“零碎的、临时的”办法，他说。

Our test activities are AD hoc and haphazard.

我们的测试活动是特定和不规则的。