The flooding occurred when the coal mine was undergoing a technological upgrade, with 29 miners working underground at the time.
透水事故发生时，煤矿正在进行技术升级，当时有29名矿工在地下工作。
| 单词 | technological upgrading |
| 释义 |
technological upgrading
原声例句
CRI在线 2021年4月合集 The flooding occurred when the coal mine was undergoing a technological upgrade, with 29 miners working underground at the time. 透水事故发生时，煤矿正在进行技术升级，当时有29名矿工在地下工作。 |
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