?原生树皮
初起[的]与继起[的]染色体不分离 primary and secondary non-disjunction (Bridge 1916) 原生树皮 primary bark 初生细胞 primary cell membrane ..
At primary school I remember learning how to identify trees by their leaves or bark.
BBC: The heartbreak of watching the slow death of ash trees
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。