我可以帮您排在候补的名单上。
这颗牙齿的根管曾经补过。你记得什么时候补的吗？
This tooth has had a root canal filling. Do you remember when it was done X?
空中客车已经把压挤失败归于缺乏一个候补的封条或者老化对封条的影响。
Airbus had attributed the extrusion failures to the lack of a backup seal or the effects of aging on the seals.
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