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
dǐqì
底气
shízú
十足
  
,
lián
连
hòupái
后排
tīngzhòng
听众
dōu
都
tīng
听
de
得
hěn
很
qīngchu
清楚
  
。

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

2
Tā
他
dǐqì
底气
bùzú
不足
  
,
pá
爬
dào
到
dìsān
第三
céng
层
jiù
就
qìchuǎn
气喘
le
了
  
。

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

3
Dǐqì
底气
jù
足

have good lungs

As a Noun

force; vigour; drive

4
Kàndào
看到
bìyèshēng
毕业生
shìyèyǒuchéng
事业有成
  
,
jiàoshī
教师
men
们
de
的
dǐqì
底气
gēng
更
jù
足
le
了
  
。

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