roofbolt

词形变化

roofbolts 复数 roofbolts roofbolted roofbolting roofbolts 三单 roofbolting 现在分词 roofbolted 过去式 roofbolted 过去分词

释义与例句

n.
  1. 1.

    A safety bolt installed in the roof of an underground mine.

    商务 采矿
v.
  1. 1.

    To install safety bolts in the roof of an underground mine.

    商务 采矿

词源

From roof + bolt.

来源：wiktionary