Lisa's parents both have jobs.
They're English teachers.
Her mother teaches English to children①.
Her father teaches English to adults. /ə'dʌlts/
They both teach at② schools.
They don't teach at the same school.
译：丽莎的父母都有工作。他们是英语教师。她的妈妈教小孩英语。她的爸爸教成人英语。他们都在学校教书。他们不在同一所学校教书。
① teach sth. to sb.
②at+具体的小的地点，in+比较大的地方(城市、国家等。)。
文中school是一个小地点，所以前面介词用at.
小：at the school / at the office
大：my mom teaches in Beijing.
Helen teaches at a primary school.
Her students are between ③7 and 9 years old.
Bill teaches in a small university.（大学：college）
His students are at least④ 18 years old.
译：海伦在一所小学教书。她的学生年龄在7到9岁之间。比尔在一所很小的大学教书。他的学生至少有18岁。
③between
1）在两个地方、物体或人之间（空间上的关系）
between you and me.你我之间
between London and Paris.在伦敦和巴黎之间。
between the bedroom and bathroom.在卧室和浴室之间。
2）在……之间（数量上的范围）
between 7 and 9 years old.在7岁和9岁之间
she runs between 2 and 4 kilometers.她每天跑2到4公里。
between 5 and 9 people.在5到9个人之间
④at least：至少 eg: my friend runs at least 2 kilometers.我朋友每天至少跑2公里。
little→比较级less→最高级least
many→比较级more→最高级most
at most:最多 eg: her students are at most 9 years old.她的学生最大9岁
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