major minor rotary

例句：

1. 1. He majored in engineering at the university.
   他在大学主修工程学。
2. 2. The team consists of a majority of female members.
   这个团队主要由女性成员组成。
3. 3. The company is majoring in renewable energy technology.
   该公司主要致力于可再生能源技术。
4. 1. She has a minor in art history.
   她主修艺术史。
5. 2. The student has minored in music for three years.
   这位学生主修音乐三年。
6. 3. The minor league baseball team has had a successful season.
   这支小联盟棒球队本赛季表现成功。
7. 1. The gyroscope is used to measure the rotation of an object.
   陀螺仪用于测量物体的旋转。
8. 2.The gyroscope was invented by James Watt in 1783.
   詹姆斯·瓦特在1783年发明了陀螺仪。
9. 3.The gyroscope is used in navigation systems to keep track of direction.
   陀螺仪用于导航系统以保持方向。