Matching sediment patterns in the fragments with those in the hollow niches where the Buddhas once stood offers key clues to the pieces' original position.
通过将残片的泥沙类型与佛龛上的黏土类型进行配比，为碎片原来所处的位置提供了重要线索。
The key ingredient in the recipe is carbon nanotubes — submicroscopic hollow tubes made of a chicken-wire-like lattice of carbon atoms.
这个实验中的关键部件是碳纳米管，即一种由类似铁丝织网一样的碳原子网格组成的亚微观中空管。
Hollow cathodes are key assemblies of reliability and life for an electric propulsion system, and their developments are strongly depended on a series of tests.
空心阴极是电推进系统可靠性和工作寿命关键部件，空心阴极研制在很大程度上依赖于阴极试验技术的支持。
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