The cathode, for instance, has to be made into a fine tip, or set of tips.
ECONOMIST: Medical technology
The researchers tried three ideas: a single tungsten tip, an array of silicon tips, and a film containing jagged fragments of synthetic diamond, whose sharp angles acted as tips.
Ly began using tip money -- and soliciting donations from tourists in lieu of tips -- to support the children's education.
CNN: Tour guide helps kids find way to school
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