| 释义 |
Definition of periodical cicada in English: periodical cicadanoun An American cicada whose nymphs emerge in large numbers in a seventeen-year (or, in the south, a thirteen-year) cycle. 周期蝉，晚秀蝉 Magicicada septendecim, family Cicadidae, suborder Homoptera. Alternative name: seventeen-year cicada Example sentencesExamples - The fact that periodical cicadas emerge after a prime number of years could be just a coincidence.
- It is not known how periodical cicadas synchronize their life cycles over 13 or 17 years - or how they manage to count out the years.
- This year, thirteen-year cicadas will appear in Louisiana, Mississippi, Arkansas, Tennessee, Kentucky, Missouri, and Illinois, and seventeen-year cicadas will show up in Ohio, Pennsylvania, and West Virginia.
- The bugs belong to the largest group, or brood, of periodical cicadas - insects that spend most of their lives as nymphs, burrowed underground and sucking sap from tree roots.
- But the lack of a viable predator control of the periodical cicadas doesn't mean the periodical cicadas have no predators, or no effect on their predators' lives.
Definition of periodical cicada in US English: periodical cicadanoun An American cicada whose nymphs emerge from the soil in large numbers periodically. The mature nymphs of the northern species (seventeen-year locust) emerge every seventeen years; those of the southern species emerge every thirteen years. A cicada brood can be so abundant that the shrill sound emitted by the males can damage the human ear. Genus Magicicada, family Cicadidae, suborder Homoptera: six species Example sentencesExamples - It is not known how periodical cicadas synchronize their life cycles over 13 or 17 years - or how they manage to count out the years.
- But the lack of a viable predator control of the periodical cicadas doesn't mean the periodical cicadas have no predators, or no effect on their predators' lives.
- The fact that periodical cicadas emerge after a prime number of years could be just a coincidence.
- The bugs belong to the largest group, or brood, of periodical cicadas - insects that spend most of their lives as nymphs, burrowed underground and sucking sap from tree roots.
- This year, thirteen-year cicadas will appear in Louisiana, Mississippi, Arkansas, Tennessee, Kentucky, Missouri, and Illinois, and seventeen-year cicadas will show up in Ohio, Pennsylvania, and West Virginia.
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