The first stage is the exploratory stage.

第一个阶段是摸索阶段。

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Ontology learning technology is still in the exploratory stage.

本体学习技术的研究目前还处于探索阶段。

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This study abroad more, recently launched a national study, but on the whole it was still in the exploratory stage.

这方面研究国外开展较多，国内近期也开展了相关研究，但总体上还处于探索阶段。

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"At this stage, our discussions are completely exploratory, with no commitment of specific plans for any shared efforts, " Nasdaq said.

BBC: Nasdaq meets with MidEast