Compared with root extraction, the direct restoration, and the crown lengthening by surgical procedure, the forced eruption is a simple, economical and practical method in clinical.
同拔出残根、直接修复和冠延长术相比，正畸(牙合)向牵引是一种简单、经济、实用的方法，值得在临床上推广。
A volcanic eruption in Iceland forced flight cancellations and the closure of airspace over the country's four international airports, an official said Sunday.
冰岛的一次火山喷发迫使航班取消和整个国家的四个国际机场关闭，一位官员周日说到。
Furthermore, the international airport in Guatemala City was also forced to close because of the volcano eruption.
由于火山的爆发，致使位于危地马拉城的国际机场被迫关闭。
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