combination of blowing and exhaust system of ventilation

例句：

1. 1. The team's performance was a combination of skill and strategy.
   团队的表现是技能和策略的结合。
2. 2. The new product is a combination of old and new ideas.
   新产品是旧思想和新思想的组合。
3. 3.The company's success can be attributed to its combination of innovation and hard work.
   公司的成功可以归因于其创新和努力的结合。