pyrans

英式音标：

美式音标：

词义：

n.【化】吡喃

网络吡喃类

变形

复数：pyrans

用法：

权威例句

Reaction of singlet oxygen with 4-methyl-2,3-dihydro-.gamma.-pyrans

Computer-assisted prediction of normal boiling points of pyrans and pyrroles

Photophysics, photochemistry and kinetics of photochromic 2 H -pyrans and chromenes

Photochromism of Synthetic and Naturally Occurring 2H-Chromenes and 2H-Pyrans

A green one-pot multicomponent synthesis of 4-pyrans and polysubstituted aniline derivatives of biological, pharmacological, and opt...

One-step synthesis of substituted 6-amino-5-cyanospiro-4-(piperidine-4')- 2H,4H-dihydropyrazolo[3,4-b]pyrans.

Amino-functionalized ionic liquid as catalytically active solvent for microwave-assisted synthesis of 4H-pyrans

Sodium bromide catalysed one-pot synthesis of tetrahydrobenzo[ b ]pyrans via a three-component cyclocondensation under microwave irr...

Sodium Bromide Catalyzed One‐Pot Synthesis of Tetrahydrobenzo[b]pyrans via a Three‐Component Cyclocondensation under Microwave Irr...

Synthesis of cyclobutenes by the novel photochemical ring contraction of 4-substituted 2-amino-3,5-dicyano-6-phenyl-4H-pyrans

造句：

1. Is his promotion evidence of the minorities' advance, or mere tokenism?

他的晋升是证明了少数族裔的进步，还是仅仅为了装点门面？

来自柯林斯例句

2. Appointing one woman to the otherwise all-male staff could look like tokenism.

给原本清一色的男职员队伍增派一位女性会显得是装点门面。

来自《权威词典》

3. Women have not even reached the level of tokenism that blacks are reaching.

妇女甚至尚未达到黑人正在达到的象征性水平.

来自辞典例句

4. Tokenism taken by the government can not change the disadvantageous position of the minority.

政府采取的这种象征性的政策并不足以改变少数民族的不利地位.

来自互联网

[ tokenism 造句 ]