| 单词 | cross section |
| 释义 | cross section 1. a section made by a plane cutting anything transversely, esp. at right angles to the longest axis. 2. a piece so cut off. 3. a photograph, diagram, or other pictorial representation of such a section. 4. the act of cutting anything across. 5. a typical selection; a sample showing all characteristic parts, relationships, etc.: a cross section of American opinion. 6. Survey. a vertical section of the ground surface taken at right angles to a survey line. 7. Also called nuclear cross section. Physics. a quantity expressing the effective area that a given nucleus presents as a target to a bombarding particle, giving a measure of the probability that the particle will induce a reaction. [1825-35] |
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