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单词 secondary wall
例句 DEFINITIVE EXAMPLES 权威例句〔pit〕Botany A cavity in the wall of a plant cell where there is no secondary wall, as in fibers, tracheids, and vessels.【植物学】 纹孔:一个没有从属内壁的植物细胞壁里的腔,如在纤维、管胞和导管中美国传统〔sclerosis〕Botany The hardening of cells by the formation of a secondary wall and the deposition of lignin.【植物学】 硬化:由于木质素和第二层壁的形成而引起的细胞变硬美国传统
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