实质无效 Substantial Invalidation
忽略无效实体 Ignore Invalid Entities
无效市场实际 EFFICIENTcMARKETcTHEORY
实体的无效性反省 Check
·2,447,543篇论文数据，部分数据来源于NoteExpress
激振力大，踏实效果好，使轨道板表面光滑无气孔，外形美观。
Moreover, a large exciting force and good compact effect ensure that the track slab is smooth in surfaces, exempt from air holes, and beautiful in exterior appearance.
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