proventil

例句：

1. 1. The vaccine is a proventil that can protect against the virus.
   这种疫苗是一种预防病毒的预防剂。
2. 2.Doctors recommend taking proventil before going to the gym.
   医生建议在去健身房之前服用预防剂。
3. 3. Proventil is often used in hospitals to treat patients with weakened immune systems.
   预防剂通常在医院用于治疗免疫系统较弱的患者。