Correct

底气

/ dǐqì /
Strokes

Definition

lung capacity/lung power/stamina/confidence

Example

As a Noun

breath; lung power

1
Lǎorén
老人
shuōhuà
说话
底气
shí
十足
  
,
lián
hòupái
后排
tīngzhòng
听众
dōu
tīng
de
hěn
qīngchu
清楚
  

The old man spoke in a resonant voice which was carried distinctly to the back row.

2
底气
不足
  
,
dào
sān
第三
céng
jiù
chuǎn
气喘
le
  

Not having good lungs, he became breathless when he climbed to the third floor.

3
底气

have good lungs

As a Noun

force; vigour; drive

4
Kàndào
看到
shēng
毕业生
shìyǒuchéng
事业有成
  
,
jiàoshī
教师
men
de
底气
gēng
le
  

Seeing the success of the alumni of their school, the teachers feel more energetic and confident in their work.