重點講解：
1. work out
鍛煉；健身；
eg. I like to go to the gym and work out.
我喜歡上健身房做運動~UDP#3g*||=NGk7FJ。
eg. Mr White keeps fit by working out for half an hour every morning.
懷特先生每天早晨鍛煉半個小時以保持健康t;DLnt*]0;NWTtxd。
2. in shape
（身體）狀況良好；（事物）情況良好；
eg. Plenty of exercise will help you keep in shape.
充分的運動會幫助你保持健康hgg6cd2~Tl&f^vI@(a6i。
eg. You'll never be in shape until you eat less and take more exercise.
只有少吃多鍛煉才能健美|s|J6P+C#+U.aZbn~];2。
3. keep up with
（與…）齊步前進；不落后（于…）；
eg. He made an arduous effort to keep up with the rest of the class.
他努力跟上班上其他同學c&aVP,^Uh%RJ~gOwa8。
eg. They walked so fast that I could not keep up with them.
他們走得那么快，我沒法跟上4@eeHqBohyq|。