Of the best quality within a graded range — where things of that kind are officially sorted into levels, this one is near the top. That is the flavour that separates it from ordinary praise: it belongs with materials and goods that really are sorted and tested, so you meet it most with steel, oil, coal, ore, paper, cotton, beef, tea, and with machine or laboratory equipment.

Of the best quality within a graded range在一個有分級的範圍裡是最好的等級——where things of that kind are officially sorted into levels也就是同類東西被正式分成好幾個等級時，this one is near the top這個是接近頂端的那種。That is the flavour that separates it from ordinary praise這種味道跟一般的稱讚不一樣：it belongs with materials and goods that really are sorted and tested它是用在真的會被分級、被檢驗的原料和商品上，so you meet it most with steel, oil, coal, ore, paper, cotton, beef, tea所以你最常在鋼材、石油、煤、礦石、紙、棉花、牛肉、茶and with machine or laboratory equipment還有機器或實驗室設備上看到它。

It is a plain, factual, technical-sounding word rather than a warm one; a shop selling handbags says 'luxury', but a factory buying metal says 'high-grade'. Its opposite is 'low-grade', which is used just as often.

It is a plain, factual, technical-sounding word rather than a warm one它是個平實、講事實、聽起來很技術性的詞，而不是溫暖的稱讚；a shop selling handbags says 'luxury'賣包包的店會說'luxury'（奢華），but a factory buying metal says 'high-grade'但買金屬的工廠會說'high-grade'。Its opposite is 'low-grade'它的反義詞是'low-grade'（低等級），which is used just as often用得一樣頻繁。

There is a second, medical use that surprises learners: doctors say 'high-grade' about a tumour or an infection to mean serious and fast-growing — good quality is not the point there at all, only the level on a scale. And in some countries 'grade' also means a school mark or a school year, so read the situation before you decide which grade is meant.

There is a second, medical use that surprises learners還有第二種醫學用法會讓學習者意外：doctors say 'high-grade' about a tumour or an infection to mean serious and fast-growing醫生會用'high-grade'來形容腫瘤或感染，意思是嚴重又快速惡化——good quality is not the point there at all, only the level on a scale在那裡完全跟品質好壞無關，只是在講一個量表上的等級。And in some countries 'grade' also means a school mark or a school year而且在有些國家，'grade'也可以指學校的成績或年級，so read the situation before you decide which grade is meant所以要先看情境，才能判斷這裡的grade是哪一種意思。