“烃基化”的英语

研究了聚氯乙烯 - 吡啶树脂催化乙酰苯胺的N - 烃基化作用,反应条件温和,产品收率令人满意.This paper studied the catalytic N - alkylation of acetanilide with polyvinyl chloride - pyridine resin.方法以3-甲氧基苯硫酚和对甲氧基 - 苯乙酮为原料经溴化、烃基化、环合重排排制得目标产物.Methods: The target comp...

bursaries的音标：...

“快”的近义词/同义词：速, 疾。...

Cuba的音标：Cuba的英式发音音标为：['kju:bə]Cuba的美式发音音标为：['kjubə]...

reddish的音标：reddish的英式发音音标为：['redɪʃ]reddish的美式发音音标为：['rɛdɪʃ]...

stanza（诗节）的原意为“房间”。A stanza is, literally, a room.今天我在学校里学了诗的三个诗节.Today I learned three verses of a poem at school.每首诗有四个诗节.There are four verses in each poem....

The crowds had been soaked and were now nicely drying out.这群人都浑身湿透，现在谢天谢地快晾干了。The crowds became violent and threw petrol bombs at the police.人群变得狂暴起来，并向警察投掷汽油弹。Sightseers may be a little overwhelmed by the crowds and noi...

ache的音标：ache的英式发音音标为：[eɪk]ache的美式发音音标为：[eɪk]...

erysodine的音标：erysodine的英式发音音标为：[ɪ'rɪsədi:n]erysodine的美式发音音标为：[ɪ'rɪsədin]...

swoop的复数形式为：swoops...

brainsick的音标：brainsick的英式发音音标为：['breɪnˌsɪk]brainsick的美式发音音标为：['breɪnˌsɪk]...

negative的近义词/同义词有：prohibiting, nullifying, conflicting, gainsaying, forbidding, vitiating, revocatory, canceling, contradicting, disapproving, invalidating, opposing, vetoing, voiding, denying, quashing, obverse, reverse...

fillet的音标：fillet的英式发音音标为：['fɪlɪt]fillet的美式发音音标为：[fɪ'leɪ]...

跑马拉松需要很大的耐力。It takes a lot of stamina to run a marathon.新兵要接受为期一周艰苦的耐力测试.The recruits were put through a week of gruelling endurance tests.有氧健身操有助于增强耐力.Aerobic exercise helps to build up stamina....

mattock的音标：mattock的英式发音音标为：['mætək]mattock的美式发音音标为：['mætək]...

v.为…的先驱( forerun的过去式 )，胜过，预示，走在…之前...