gym             
noun uk/dʒɪm/ us/dʒɪm/
A2 [ U ](尤指作为学校课程的)体操,健身操 
physical exercises and activities performed inside, often using equipment, especially when done as a subject at school
  gym clothes 体操服 
 gym shoes 体操鞋 
 Class 3 do gym on a Wednesday afternoon. 三班周三下午上体操课。 
 The third graders have gym on Tuesdays and Thursdays. 三年级学生在星期二和星期四有体操课。 
 A2 [ C ] (also gymnasium)体操馆,健身房 
a large room with equipment for exercising the body and increasing strength
  We played basketball in the gym. 我们在健身房打了篮球。 
  [ C ]健身俱乐部 
a club where you can go to exercise and keep fit
  I go to the gym twice a week. 我每周去两次健身俱乐部。 
 - More examples
 - A work-out in the gym will exercise all the major muscle groups.
 - He works in a sports centre instructing people in the use of the gym equipment.
 - I felt so unfit after Christmas that I decided to join a gym.
 - A figure like that is usually the product of many hours spent in the gym.
 - I like to sweat it out in the gym for a couple of hours every day.