1.quality的基本意思是“质量”,指产品、商品或工作的优劣程度,也可用于人,指品质。可用作不可数名词,也可用作可数名词。
2.quality用于指“商品”时,表示商品“质量”,通常用单数形式quality; 表示“商品的性能”时一般用复数形式qualities。
3.quality用于指“人”,表示“才能”“本领”时通常用单数形式quality; 表示“品质”时多用复数形式qualities; 表示暂时具有的地位、身份或作用时常用于短语in (the) quality of中。
4.of quality修饰产品或商品时指“优质的”,修饰人时指“素质好的”,此时quality前无须再加good等词。
5.quality也可作“属性,特征”“特点,特色”“品种”解,是可数名词。
6.the quality可作“上流社会,上等人”解,有鄙视的意味。
7.quality有时可置于另一名词前作定语,意为“优良的”“优质的”,主要用于美式英语。

of quality
优质的,素质好的 good quality
These are leather goods of high quality.这些是高质量的皮革制品。
Our candidate is a man of quality, of status, of caliber.我们的候选人是个素质好、有身份和有能力的人。
It is difficult to engage teachers of quality.很难招聘到优秀教师。

The quality is the same, but the qualities are different.质量一样,但性能不同。
It's cheap, but on the other hand the quality is poor.它是便宜,但另一方面质量差。
The quality of this suit is not quite consonant with its price.这套衣服的质量与价钱不太相符。
Siｚe matters less than quality.大小不如质量重要。
The car is inferior in quality.这辆轿车质量差。
The deduction in price should not be detrimental to the quality.减了价格,但绝不能有损于质量。
This painting is of remarkable quality.这幅画是上乘之作。
This cloth is of medium quality.这布是中等质地的。
We never use second quality ingredients.我们绝不使用次等配料。
Poor quality goods won't sell easily.质量差的货不容易卖出。
In a long run, it is an economy to buy good quality goods, even though they cost more.购买质量好的货物,虽然价格较贵,但是到头来是经济的。
But we still have a long way to go because few areas of the country are free of water quality problems.然而我们还有很长的路要走,因为国内几乎没有几个地区不存在水质问题。
I am sixty-and-five, and I have knocked about in the world and tasted the quality of life.我六十有五,在世界各地漫游过,饱经人间的坎坷。
She had many good qualities despite her apparent rudeness.她粗鲁是粗鲁,但还有许多优秀品质。
He has many good qualities, but his best quality is his kindness.他有许多良好的品质,而最好的品质是为人善良。
One quality of this kind of timber is that it can be sawn easily.这种木料的一个特点是容易锯开。
His voice had a rich melodic quality.他的音色浑厚而优美。
They have stockpiled qualities of weapons.他们储备了各种各样的武器。
By degrees the quality gave up going, and the fair, of course, became disreputable.上流人渐渐不去那儿了,当然集市就变得破旧不堪了。

下面各组短语的意思不同:
quality suits
名优服装
suits of quality
优质服装
quality people
显赫人士
people of quality
素质好的人

1.大卫检查了家具的质量。
［误］  David examined the qualities of the furniture.
［正］  David examined the quality of the furniture.
这家商店为其酒的质量自豪。
［误］  The store is proud of the qualities of its wine.
［正］  The store is proud of the quality of its wine.
［析］  quality作“质量”解时通常用单数形式。
2.他具有成功商人的所有品质。
［误］  He has all the quality of a successful businessman.
［正］  He has all the qualities of a successful businessman.
勇敢是一个好士兵的品质之一。
［误］  Courage is one of the quality of a good soldier.
［正］  Courage is one of the qualities of a good soldier.
［析］  quality作“品质”解时是可数名词,以上两句应该用复数。
3.我们产品质量的稳步提高在很大程度上归功于设备的改进。
［误］  The steady rise in the quantity of our products owes much to the improvement of the equipment.
［正］  The steady rise in the quality of our products owes much to the improvement of the equipment.
［析］  quantity是“数量”, quality才是“质量”,这两个词形似义不同。

quality还可用作形容词,意思是“优良的”。例如：
He settled in to read Edmund Wilson.It was quality time.他坐下来读爱德蒙·威尔逊的书,这是一个极其美妙的时刻。

［同义词］   aspect, character, class, condition, feature, nature, status, talent
［词源］  ＜古法语qualite＜拉丁语qualitas(质量,品质)