The key to successful tower construction and erection is to determine the center of gravity .

重心的确定是铁塔组立能否成功的关键之一。

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I have the key to the tower.

我有那座钟塔的钥匙。

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The key points of resin tower operation were defined.

确定了树脂塔的操作要点。

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The key points of resin tower operation were defined.

确定了树脂塔的操作要点。

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