求翻译：我们学校有50多年的历史，每年的升学率非常的高，我们的学校总共有3个年级，每个年级20个班，我们学校有3幢教学楼，一座实验楼，一座办公楼是什么意思？

Our school has 50 years of history, the annual transition rate is very high, our schools a total of three grades, each grade 20 classes, our school has three school buildings, a laboratory building, an office building

Our school has a history of more than 50 years, the annual rate of higher education in our schools is very high, a total of three grades, each grade, our school has 20 classes 3 school building block, a lab building, an office building

Our school has more than 50 years history, every year proportion of students entering schools of a higher grade unusual high, our school altogether has 3 grades, each grade 20 classes, our school has 3 classroom buildings, an experimental building, an office building

Our school has a history of more than 50 years, the annual percentage is very high, our school there are 3 grades, each grade 20 classes, our school has 3 teaching buildings, a laboratory building, a city office building

Our school has a history of more than 50 years, the annual percentage is very high, our school there are 3 grades, each grade 20 classes, our school has 3 teaching buildings, a laboratory building, a city office building