He cautioned that the Russia-American discussions were still in an exploratory stage.

他警告说俄美会谈尚处于索阶段。

If no clinical effect is achieved after expectant treatment and extra-spinal diseases were excluded, exploratory operation inside canalis spinal should be employed.

经保守治疗后无效及排除其它椎管外疾患后，行椎管内手治疗。

The exploratory testing study of modifying and fining the solidification structure of concast steel billet is carried out in concast production by the technology of electro-pulse modification.

在连铸生产中利用电脉冲孕育处理技,开展改善和细化连铸坯凝固组织的试验研究。