pencil beam
noun
A narrow beam of light or radiation; specifically a beam (typically of approximately circular cross-section) in which the individual rays (or paths of particles) are nearly parallel.
Origin
Early 20th century.
| 单词 | pencil beam |
| 释义 | pencil beamnoun A narrow beam of light or radiation; specifically a beam (typically of approximately circular cross-section) in which the individual rays (or paths of particles) are nearly parallel. Origin |
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