The third group were prepared using the stainless steel hand K-files with the step-down technique(SS group).

不锈钢K锉组（SS）采用常规手用不锈钢K锉、逐步后退法预备根管。

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Nailing down the technique for the detection of water is a key step toward finding Earth-like planets that have water and other key life-related molecules, Deming said.

戴明指出，确定水的探测技术是发现类地行星的关键步骤，这种行星可能拥有水和其他与生命相关的重要分子。

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Nailing down the technique for the detection of water is a key step toward finding Earth-like planets that have water and other key life-related molecules, Deming said.

戴明指出，确定水的探测技术是发现类地行星的关键步骤，这种行星可能拥有水和其他与生命相关的重要分子。

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