從「the sleeper of the summer是'黑馬'嗎？」看什麼叫「學並學好」英語
用中文「學會」了一句英語和用英語「學並學好」一句英語是本質完全不同的兩個學習行為。前者永遠是「以母語思維學外語」心態，後者也是「以母語學母語」的方式，也就是「學並學好」（任何一門語言）。
學習的英語：
No one had expected it.But his new movie turned out to be the sleeper of the summer.
我提供兩種學習方法供大家參考：
1) 我們可以「用中文學會一句英語」：
1. 黑馬；意外成功的人（或事物）：chiefly US, informal : someone or something that suddenly becomes successful in a way that was not expected.
2.百度了一下，原來是「黑馬」的意思
3. 是summer hit的另外一種說法
用中文學英語，用會讓我們發問：中文「黑馬」不是英語dark horse嗎？怎麼成了英語the sleeper了？
用英語學英語，我們問的就是：So,what is the difference between a dark horse and the sleeper when they both mean suddenly become successful in a way that was not expected?
2) 我們「用」英語學並學好英語the sleeper (of the summer)：
用外語學外語難度相對大一點了。但「風險大，回報也大」。也只有在大量的英語語言環境中，雖然不能像語言學家那樣精確，我們才真正區分二者大致的不同。
1. A sleeper is also called a sleeper hit in the movie,or film industry.
「說」英語：Okay.I got you.We usually say a sleeper,or a sleeper hit when we talk about an unexpected success for a movie
For example. That low-budget film became the summer's sleeper,a sleeper of the summer,a sleeper hit this year.
2.A sleeper,or a sleeper hit is an unexpected success, esp. a film or play originally ignored or considered a failure,or unpromising or unnoticed that suddenly attains prominence or value.
「說」英語（能說嗎？）：Okay.I got you.
Okay.I got you.If a movue,a film is an unexpected success, especially when it is originally ignored or considered a failure= unpromising or unnoticed（用詞好豐富啊）
For example.Some sleeper hits achieve unexpected success at the box office
小結：Okay.I got you.A sleeper,or a sleeper hit=a movie=box office.
3) 我們用英語學並學好英語a dark horse：
1.A dark horse is someone who unexpectedly wins a competition.
「說」英語：Okay.I got you.
We usually a dark horse for a competition,an unexpectedly win,or success in a competition,like a horse race,like an election.
2. A dark horse is someone who wins a contest, race, etc when they were not expected to.
「說」英語：Okay.I got you.
If you win unexpectedly in a competition=a contest,we'll say You're a dark horse,not a sleeper,or a sleeper hit.You're not a movie after all.
所以，英語a dark horse是中文「黑馬」的話，英語a sleeper (hit)就是中文「爆冷門」了。
反過來，你是中國人，你又能向學習英語的外國人解釋清楚「黑馬」和「爆冷門」的區別嗎？
不見得：所以，「會用」一門語言不代表「掌握」一門語言。
「會用」是指在語言環境下能交流而已。「掌握」也是沒有語言環境也知道它的含義和區別。