Correct

飞灵

/ fēi líng /
Strokes

Example

As an Adjective

very smart; sharp; resourceful

1
Nǎozi
脑子
fēilíng
飞灵

be sharp-minded

As an Adjective

efficacious; effective

2
Zhèzhǒng
这种
yào
zhì
liúgǎn
流感
  
,
fēilíng
飞灵
  

The medicine is very efficacious against flu.