由传感器、作动器与梁主体结构组成梁式自适应结构。

The adaptive beam is composed of piezoelectric ceramic sensors, actuators, and a flexible beam.

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这些因其密度而被著称为 la foret（森林）的梁，组成了横跨大教堂中心部分的十字形屋顶。

These beams, known as la foret (the forest) because of their density, formed the cross-shaped roof that ran the length of the central part of the cathedral.

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周一下午6点40分左右，大火从93米高的塔尖底部开始，蔓延到教堂的屋顶。教堂的屋顶由数百根橡木梁组成，其中一些梁的历史可以追溯到13世纪。

The fire, which had started at the base of the 93-metre spire at about 6: 40 pm on Monday, spread through the cathedral's roof, made up of hundreds of oak beams, some dating back to the 13th century.

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