英汉词典

alder 基本解释

• n. [林] 桤木

alder 词态变化

alder 中文词源

来自PIE *el, 树名。

alder 英文词源

alder

alder: [OE] Alder is an ancient tree-name, represented in several other Indo-European languages, including German erle, Dutch els, Polish olcha, Russian ol’khá, and Latin alnus (which is the genus name of the alder in scientific classification). Alder is clearly the odd man out amongst all these forms in having a d, but it was not always so; the Old English word was alor, and the intrusive d does not begin to appear until the 14th century (it acts as a sort of connecting or glide consonant between the l and the following vowel, in much the same way as Old English thunor adopted a d to become thunder). The place-name Aldershot is based on the tree alder.

alder (n.)

tree related to the birch, Old English alor "alder" (with intrusive -d- added 14c.; the historical form aller survived until 18c. in literary English and persists in dialects, such as Lancashire owler, which is partly from Norse), from Proto-Germanic *aliso (cognates: Old Norse ölr, Danish elle, Swedish al, Dutch els, German erle), from *el-, the ancient PIE name of the tree (cognates: Russian olicha, Polish olcha, Latin alnus, Lithuanian alksnis).

alder 英文释义

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

alder 双语例句

1. 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.

来自辞典例句

2. Diels — Alder reaction is one of the important research content in the fields of organic chemistry.

Diels—Alder反应是目前有机化学领域重要研究内容之一.

来自互联网

3. Activated olefinic bond Amine, thiol radical initiator, cationic initiator, dienes ( Diels - alder reactive ).

活性烯键胺, 巯基,引发剂, 阳离子引发剂, 烯烃 ( 的Diels-Alder反应 ).

来自互联网

4. 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.

来自互联网

5. 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.

来自互联网

alder 实用场景例句

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.

辞典例句

Material: Gold Plated Alder Cone, gold plated bookmark.

素材: 镀金桤木球果吊饰, 镀金书签.

期刊摘选

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.

辞典例句

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.

期刊摘选

The alder nitrogen fixation promoted growth of the after crop.

十年生桤木林采伐迹地上,桤木固氮改良土壤,并促进后续植物的生长.

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Diels — Alder reaction is one of the important research content in the fields of organic chemistry.

Diels—Alder反应是目前有机化学领域重要研究内容之一.

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Material: Gold Plated Alder Cone, Green Chorite Crystal, gold plated bookmark.

素材: 镀金桤木球果吊饰, 绿幽灵水晶, 镀金书签.

期刊摘选

Alder has no problems with sap , mineral streaks, dark colors or staining.

桤木边材, 矿物线, 颜色变深或色变都没有问题.

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When they reach the destination, Alder stopped the car and let her go down.

到了那个女生所说的地方时, 阿德就停车好让她下车了.

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The genetic responses of 13 alder ( Alnus cremastogyne ) provenances was evaluated for at 5 test locations.

对桤木13个种源在5个测试点进行了生长性状的遗传测定.

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Alder trees belong to the birch family.

赤杨属于桦木科.

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The tiniest unfurling of pale green at the tips of the alder trees'branches.

赤杨树的树梢泛着隐隐约约的绿.

期刊摘选

Suddenly, Alder think of the girl haven't paid him the taxi fare.

阿德突然想起还未向那位女生收钱,不反过头还好.

期刊摘选