Regular irregularities occur with constant periodicity and are usually associated with partial heart block.
规律的不整脉随固定周期出现，而且常伴有心脏部分传导阻滞。
Assessment on stability of partial rock-block mass is essential during tunnel's design and construction.
隧道围岩局部块体稳定性分析是隧道设计和施工过程中必不可少的环节。
Assessment on stability of partial rock-block mass is essential during tunnel's design and construction.
隧道围岩局部块体稳定性分析是隧道设计和施工过程中必不可少的环节。
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