radical

Compared meaning: new or different, from mild to extreme (adjective).

比较义项：新的、与以往不同的（程度从「新近出现」到「彻底颠覆」不等）（形容词）。

• new

  The mildest of the four; simply means something has just appeared or been acquired, with no implication of being different or extreme. Common with ordinary nouns like a job, apartment, or idea.

  四词中语气最弱，只表示某事物刚刚出现或刚刚获得，并不暗示与以往不同或程度极端，常与工作、公寓、主意等普通名词搭配。

  The company hired new staff for the summer season.

  公司为暑期招聘了新员工。

• fresh

  Emphasizes novelty and a marked difference from what came before, often paired with words like idea, approach, or start; stronger than 'new' but far weaker than 'radical'.

  强调新颖、与以往明显不同，常与主意、方法、开始等词搭配；语气比new强，但比radical弱得多。

  After the divorce, he moved abroad for a fresh start.

  离婚后，他搬到国外，开始了全新的生活。

• radical 本词

  Describes ideas or changes that are extreme and go against convention, often controversial or ideological; much stronger than 'fresh', not necessarily total transformation like 'revolutionary'.

  形容极端、违背常规的想法或变革，常带有争议性或意识形态色彩；语气比fresh强得多，但不一定像revolutionary那样是彻底的变革。

  The senator proposed radical reforms to the tax system.

  这位参议员提出了对税收制度的激进改革。

• revolutionary

  Describes a change so complete and dramatic that it transforms an entire field or system, often used positively for breakthroughs; the strongest of the four.

  形容彻底、戏剧性的变化，能改变整个领域或体系，常用于褒义地形容突破性成果；是四词中语气最强的。

  The new vaccine was hailed as a revolutionary medical breakthrough.

  这款新疫苗被誉为革命性的医学突破。

New, fresh, radical, and revolutionary all describe something different, but the strength differs. New is mildest, meaning something recently appeared. Fresh means noticeably different, stronger than new. Radical means extreme change against convention. Revolutionary means a complete, dramatic change, the strongest of all.

这四个词都能形容「新颖、与以往不同」的事物或变化，但程度不同：new语气最弱，只表示新近出现；fresh强调新颖别致，比new更强；radical和revolutionary都表示彻底、极端的改变，语气最强，其中revolutionary更强调「划时代、颠覆性」。这里不比较new表示「崭新、未曾使用过」的意思，也不比较fresh表示「新鲜（食物未变质）」的意思，不比较radical在数学中表示「根」或作名词表示「激进分子」的意思，也不比较revolutionary表示「与政治革命相关」的意思。

Compared meaning: basic or fundamental (adjective).

比较义项：根本的、基本的（adj.）。

• radical 本词

  Describes change that is thorough, drastic, or extreme — a complete break from what came before, not just a small improvement. Common with words like change, reform, idea.

  形容变化彻底、剧烈，与以往完全不同，而不仅是小幅改进；常用来修饰“变革”“改革”“想法”等词，强调根本性和彻底性。

  The new manager introduced some radical changes to our daily schedule.

  新经理对我们的日常安排做出了一些根本性的改变。

• primary

  Means chief or most important among several things, ranking it first in priority, not necessarily the most foundational. Common with words like goal, reason, concern.

  表示在多个事物中最重要、排在首位，强调优先次序，而不一定指基础性；常用来修饰“目标”“原因”“关切”等词。

  Reading is the primary goal of this class.

  阅读是这门课的首要目标。

• basic

  Describes something elementary and necessary that forms the starting foundation others build on, simple rather than advanced. Common with words like skills, grammar, needs.

  形容某事物是初级的、必要的，是他人在此基础上进一步发展的起点，简单而非高级；常用来修饰“技能”“语法”“需求”等词。

  Learning basic grammar helps you write clearer sentences.

  学习基本语法有助于你写出更清晰的句子。

Radical, primary, and basic can all mean fundamental. Radical describes change that is thorough and drastic, a complete break from before. Primary means most important, or first in priority. Basic describes something elementary that forms the starting foundation others build on.

这三个词在“根本的/基本的”这一意义上较为接近，但语气和侧重不同：radical 强调彻底、剧烈的变化；primary 强调重要性上排在首位；basic 强调初级、必要的基础性。这里不比较 primary 表示“小学的”（如 primary school）以及 radical 表示“激进的”（如 radical views）等其他义项。