中空充钠气门并不是一个全新的概念，但是过去他们造价高昂。
Sodium infill valves are not a new concept, but in the past they have been extremely costly to build.
它是一场造价高昂的公关活动，一部孩之宝公司的营销机器。
It is an expensive PR event, a big marketing machine for Hasbro.
造价高昂的档案馆文献数字化进程仍将继续，但仅限于许多人将付费查阅的文献。
The expensive process of digitising the archive’s treasures will continue, but only for documents that lots of people are likely to pay to see.
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