Tunnel in hard rock may be excavated in whole section by using chiseling rock trolley to drill small holes.
在硬岩中中隧道可采用凿岩台车钻眼，进行全断面开挖。
The dual-point meshing in single-drive BF flexible-transmission device will promote its bearing capacity by two small pinions which are setting in a small slung trolley to driving big one altogether.
双点啮合单驱动BF型多柔传动装置，通过在悬挂小车内设置两个小齿轮共同来驱动一个大齿轮，使其承载能力提高一倍。
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