a tractor serves several purposes meaning in Chinese

• 一机多用

• tractor:    n. 拖拉机；牵引车；〔空〕牵引式飞 ...
• serve:    vt. 1.(为…)服务；为…尽力[ ...
• several:    adj. 1. 几个的；(二以上)多 ...
• purpose:    n. 1.目的，宗旨，意向。 2.决 ...