This study found that concrete which contained a high proportion of long steel fibres in its structure worked best.

研究发现，加有大量长钢质纤维的混凝土性能最佳。

The beam itself will be produced by a device called a fibre laser, this generates the coherent light of a laser beam in the core of a long, thin optical fibre.

激光波束本身将由光纤激光设备产生并在一个细长的光纤核心产生激光束的相干光。