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If a way of doing something is practicable, you can actually do it in this situation — the path is possible, not only nice to imagine. A plan can be clever and still not practicable: no road, no money, no time, or the law says no.
If a way of doing something is practicable如果做某件事的方法是可行的 you can actually do it in this situation代表在這個情況下你真的做得到 the path is possible這條路是可能的 not only nice to imagine不只是想像起來很美好 A plan can be clever and still not practicable一個計畫可以很聰明，卻還是不可行 no road, no money, no time, or the law says no沒有路、沒有錢、沒有時間，或是法律不准
It is a formal, slightly official word. British law and workplace rules love the phrase reasonably practicable: do what you reasonably can, given real limits, not what a perfect world would demand.
It is a formal, slightly official word這是個正式、有點公文味的字 British law and workplace rules love the phrase reasonably practicable英國的法律和職場規定很愛用reasonably practicable（合理可行）這個說法 do what you reasonably can, given real limits在現實限制下，做你合理能做到的 not what a perfect world would demand而不是要求一個完美世界才做得到的標準
Though actually, this is the word English mix with practical all the time. Practical means useful, sensible, good at real problems ("a practical person," "practical shoes").
Though actually不過實際上 this is the word English learners mix with practical all the time這個字是英文學習者最常跟practical搞混的字 Practical means useful, sensible, good at real problemsPractical指的是有用、明智、擅長處理實際問題 ("a practical person,"（"a practical person"務實的人、 "practical shoes")"practical shoes"實穿的鞋）
Practicable almost never describes a person. You can say a method is practicable; you do not say "she is very practicable." A tool can be practical (useful) while a plan is still not practicable (not possible to carry out this week).
Practicable almost never describes a personPracticable幾乎不會用來形容一個人 You can say a method is practicable你可以說一個方法是可行的 you do not say "she is very practicable."但你不會說"she is very practicable" A tool can be practical (useful)一個工具可以是practical（實用）的 while a plan is still not practicable (not possible to carry out this week)同時一個計畫卻仍然not practicable（這星期做不到）
組成Borrowed from Latin prācticābilis, partly modelled on Middle French praticable. By surface analysis: practice (to carry out) + -able (can be done).
同家族的字
- practicethe verb in the surface analysis: able to be put into practice
- practicabilitythe noun: how possible it is to carry out
- practicablythe adverb
- practicalsame Latin/Greek stem for doing, but the meaning is different: useful or sensible, not "possible to carry out"
原始詞典資料3 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。
practicableadj/ˈpɹæktɪkəbəl/
- 1
Capable of being accomplished; feasible.
- Those who have concerned themselves exclusively with what seemed practicable in the existing state of opinion have constantly found that even this has rapidly become politically impossible as the result of changes in a public opinion which they have done nothing to guide.
- The law in most states says that cyclists must ride as far to the right as is practicable.
- 2
Serving a useful function; useful, functional or handy.
- 3
Available for use; accessible or employable.
- I glanced up, — there was no trap door which led to the roof. No practicable nook or cranny, in which a living being could lie concealed, was anywhere at hand.
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。