To ensure safety, protection measure, such as advanced and practical "blasting quilts" and steel-pipe row frame, is adopted.
为确保既有线安全，采用的先进实用的“炮被”和“钢管排架”防护措施。
To ensure safety, protection measure, such as advanced and practical "blasting quilts" and steel-pipe row frame, is adopted.
为确保既有线安全，采用的先进实用的“炮被”和“钢管排架”防护措施。
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