As it turns out, the tower's strength is largely due to that near-forgotten puddle iron — the engineers estimate that the tower will still be standing for at least another two or three centuries.

工程师预计埃菲尔铁塔至少还会继续屹立2到3个世纪。

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That distance, engineers estimate, is around 2, 034 feet (620 meters).

CNN: STORY HIGHLIGHTS

That distance, GeoTech engineers estimate, is 624 meters.

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