root system
(mathematics) A logarithmic line on a Gunter's scale, which is used to perform the multiplication and division of numbers mechanically with only dividers.
(botany) The structure comprising the roots of a plant.
plural of echo
simple past tense and past participle of fill one's boots
その植物の根系は土の中深くまで広がり、嵐の際にそれをしっかりと支えた。
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