合乎道理（講理·站得住腳）
最核心的一支：某個想法、要求或判斷合乎常理、站得住腳，講道理的人都會認同。
fair, sensible · adjective · B1
Fair and sensible, in a way most people would agree with.
合理的／講理的
核心畫面
You can picture reasonable as whatever a fair, level-headed person would nod at: it sits inside the bounds of good sense — not extreme, not unfair, nothing you could argue against.
可以想成：一個講道理、頭腦冷靜的人會點頭接受的東西——它落在「合乎常理」的範圍內，不極端、不過分，讓人挑不出理由反對…更多收起
可以想成：一個講道理、頭腦冷靜的人會點頭接受的東西——它落在「合乎常理」的範圍內，不極端、不過分，讓人挑不出理由反對。reasonable 就是替某樣東西貼上「這說得通、在合理範圍內」的標籤。Two branches
在合理範圍內（還可以·公道·相當）
從「合乎常理」滑到「落在合理範圍內」：程度、品質、價錢都不極端，停在讓人可以接受的那一格——不是頂尖，但也挑不出毛病。
fairly good · adjective · B1
Fairly good, but not the best.
還不錯的
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
reasonableadj/ˈɹiː.zə.nə.bəl/
- 1
archaicHaving the faculty of reason; rational, reasoning.
- The wiſdome and underſtanding of this Beaſt [the beaver], vvill almoſt conclude him a reaſonable creature: […]
- 2
Just; fair; agreeable to reason.
- The episode also opens with an inspired bit of business for Homer, who blithely refuses to acquiesce to an elderly neighbor’s utterly reasonable request that he help make the process of selling her house easier by wearing pants when he gallivants about in front of windows […]
- 3
Not excessive or immoderate; within due limits; proper.
- a reasonable demand, amount, or price
- 4
Not expensive; fairly priced.
- $20 a bottle is very reasonable for a good wine at a restaurant.
- Say, would you happen to know a good place for lunch in the downtown area? ... The Radisson ... Oh yah? ... Is it reasonable?
- 5
Satisfactory.
- The builders did a reasonable job, given the short notice.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。