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Quality，Standard，Level，Grade
水准。
🚩quality是“东西的好坏，尤其是在与同类事物比较的时候”，柯林斯解释为The quality of something is how good or bad it is.。
如：
Everyone can greatly improve the quality of life... 每个人都可以大大改善生活质量。
Other services vary dramatically in quality. 其他服务在质量上差别很大。
🚩standard是“合格的水平，水准”，柯林斯解释为A standard is a level of quality or achievement, especially a level that is thought to be acceptable.。
如：
Who set the standard for water quality? 水质标准由谁来定？
The standard of professional cricket has never been lower... 职业板球的水平从来没有这么低过。
There will be new national standards for hospital cleanliness. 有关医院清洁的新国家标准将会出台。
🚩level是“成就、进步、能力的等级、程度”，柯林斯解释为A level is a point on a scale, for example a scale of amount, quality, or difficulty.。
如：
This computer game has fifteen levels. 这款电脑游戏有十五级。
We do have the lowest level of inflation for some years.我们的通货膨胀率多年来确实一直保持在最低水平。
🚩grade是“对产品或者材料做正式评定的等级”，柯林斯解释为The grade of a product is its quality, especially when this has been officially judged.。
如：
All the materials used were of the highest grade. 所用的材料全是最上等的。
a piece of top grade beef 一块顶级牛肉
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