Why are the lupanine derivatives bitter ?

为什么白金雀儿碱派生物是苦？

He is bitter in his condemnation of terrorism.

他言辞激烈地谴责恐怖主义。

He gave Helen a look of bitter reproach.

他责怪地冷冷看了海伦一眼。

He liked the bitter taste of the ale.

他喜欢麦芽酒苦味。

They were all sympathetically disposed towards her bitter experience.

他们都对惨遭遇寄予同情。

St Ambrose would weep bitter tears when confessing a sinner.

圣安布罗斯聆听罪人忏悔时，会流下苦泪水。

I felt the sting of the cold, bitter air.

我感到寒风刺骨。

The two countries fell out in a bitter wrangle over imports.

这两个国家在有关进口问题激烈争吵闹翻了。

Everything new comes from the forge of hard and bitter struggle.

一切新东西都是从艰苦斗争锻炼出来。

But some bitter substances in it such as elaterin are unacceptable.

于苦瓜含有苦瓜素等物质,苦味较重,令一些消费者难以接受。

Thy wit is a very bitter sweeting; it is a most sharp sauce.

你笑话又甜又辣；简直是辣酱油。

His visit churned up bitter memories.

他来访激起了痛苦回忆。

It tastes bitter.

这东西吃起来很苦。

Quinine has a bitter taste.

奎宁有苦味。

This is a novel depicting the bitter sufferings of the inmates in a Nazi concentration camp.

这是一本描写关押在纳营人受苦受难小说。

Sour, sweet, bitter, spiciness and fishiness numb our taste bud so that we cannot taste the light sweet.

酸、甜、苦、辣、腥等麻木我们口味、舌蕾，再也品尝不出清淡香甜。

The tannin makes this grape very suitable for ripening on oak barrels.This makes the bitter tannin souple and soft.

单宁是这种葡萄酿制酒非常适合在橡木桶成熟， 这可以使单宁苦涩感变更柔顺，圆润。

At the age of 40, King Gillette was a frustrated inventor, a bitter anticapitalist, and a salesman of cork-lined bottle caps.

40岁时，金·吉列不过一失意发明人，激烈反资本主义者，软木衬瓶盖推销员。

This paper has studied the phthalocyanin complex of Cobalt synthesized by benzene bitter wine-urea law,and after depuration,an infrared, ultra-violet spectrograph determination is carried.

文章主要研究了苯酐-尿素法合成酞菁钴、经提纯并对其进行红外、紫外光谱测定、合成及表征结果表明,红外光谱表征推测结构可靠,紫外光谱分析表明有特征吸收峰之处。

Modern medicine studies: The bitter ginseng in thinking suffering is joined commonly is alkaline reach furzy alkaline have fight rhythm of the heart wrong action.

一般认为苦参苦参碱及金雀花碱具有抗心律失常作用。