bac
bac — noun
- bacsingular
- bacsplural
1. the final set of secondary-school exams in France and similar systems, used for
the final set of secondary-school exams in France and similar systems, used for graduation and for applying to university
Beatriz spent the spring revising for the bac with her classmates in Lyon.
revise for the bac before final exams
After passing the bac, Ilan applied to study history at Sorbonne University.
pass the bac before university application
Aylin's older cousin failed the bac once and took it again next year.
French news channels discussed whether this year's bac papers were too hard.
Parents waited outside the school while Minho finished his morning bac paper.
- baccalaureate
the full formal name of the same exam
- school-leaving exam
a general term for this type of final exam in many countries
- A levels
a British equivalent in function, but not the same qualification
用法筆記
Usually appears with the article 'the' and with verbs such as take, pass, revise for, or sit. Outside France and similar education systems, writers often explain it or use the full word 'baccalaureate' on first mention.
常見錯誤
bac — abbreviation
1. a measure of how much alcohol is in a person's blood, especially when police, do
a measure of how much alcohol is in a person's blood, especially when police, doctors, or courts need to check it
The officer told Christopher his BAC was above the legal limit.
BAC reading in a drink-driving stop
At the hospital, Ingrid's BAC was tested after the car crash.
medical test of BAC after an accident
The article explains how food can affect your BAC more slowly.
Police recorded a BAC of 0.09 after the late-night traffic stop.
Romi waited an hour before driving, but her BAC stayed too high.
- blood alcohol concentration
the full formal expansion used in reports and laws
- blood alcohol content
an alternative full form with the same meaning
- alcohol level
a broader everyday phrase; less technical than BAC
文法句型
BAC + be + above/below the limit
check someone's BAC
BAC of + number
用法筆記
Usually appears in legal, police, or medical contexts and often follows numbers such as 0.05 or 0.08. In everyday speech, people may say 'alcohol level', but reports and laws usually use BAC.
常見錯誤
2. a large DNA carrier used in genetic research to keep long pieces of DNA inside b
a large DNA carrier used in genetic research to keep long pieces of DNA inside bacteria so they can be copied and studied
The lab stored the long DNA piece in a BAC before sequencing it.
store long DNA in a BAC
Amani learned that a BAC can carry more DNA than a plasmid.
BAC compared with a plasmid
Researchers picked a BAC clone that contained the gene they needed.
The handbook says each BAC must be kept in living bacteria.
- bacterial artificial chromosome
the full scientific term expanded from BAC
- vector
a broader lab word for a DNA carrier; less specific than BAC
- clone
can refer to one BAC-containing DNA sample rather than the carrier type
文法句型
store DNA in a BAC
BAC clone
BAC library
用法筆記
Usually appears in genetics papers, lab notes, and method sections rather than general English. The term names the DNA carrier itself, while a 'BAC clone' is one specific DNA insert held in that carrier.