alder是什么意思？

alder

英[ˈɔ:ldə(r)] 美[ˈɔldɚ]

• n. 桤木；

复数：alders;

例句

• The microorganisms involved in symbiosis with the alder tree are actinomycetes of the genus Frankia. 而与赤杨共生的微生物是放线菌.
• Diels - Alder reaction of 2 - merhylene - 1 - pheny 1 - 1.3 - butanedione catalysed by zinc chloride as lewis acid with 1.3 - cylcopentadiene was reported. 以氯化锌为路易斯酸催化剂,探讨了2 ─ 亚甲基─1 ─ 苯基 ─ 1.3 ─ 丁二酮与1.3 ─ 环戊二烯的Diels─Alder反应.
• Alder ( Alnus nepalensis ), an important non - legume nitrogen - fixing plant, occurs widely in the eastern Himalayas. 桤木 ( Alnusnepalensis ) 是一种重要的 非 豆科固氮植物, 广泛分布于喜马拉雅山脉东部地区.
• They were principally used to catalyze aldol, allylation, Diels - Alder, ene and Friedel - Crafts reactions. 它们主要被用来催化Aldol, 烯丙基化, Diels-Alder, Ene和 Friedel -Crafts等反应.
• Its name is Ben Alder , it is a wild , desert mountain full of hills and hollows. 它的名字是本·亚尔德, 是一座尽是些山岗和鸡谷的漠无人烟的荒山.
• The meanders of a prattling brook, were shaded with straggling willows and alder trees. 一条小河蜿蜒掩映在稀疏的柳树和桤树的树荫间,淙淙作响.
• Modification for synthetic purposes on the Diels - Alder adducts 56 and 62 has only rarely been considered. 为了达到合成的目的,对Diels-Alder加 成物(56)和(62)加以改造的问题很少有人考虑.

柯林斯高阶英汉双解学习词典释义

• N-VAR
  桤木
  An alder is a species of tree or shrub that grows especially in cool, damp places and loses its leaves in winter.

英英词典释义

• Noun
  1. wood of any of various alder trees; resistant to underwater rot; used for bridges etc
  2. north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the rot-resistant wood