Correct

苦战

/ kǔzhàn /
Strokes

Definition

bitter struggle/hard battle/arduous effort

Example

As a Verb

fight/battle bitterly

1
men
他们
zhàn
苦战
liǎng
tiān
  
,
zhōng
终于
得以
tuōxiǎn
脱险
  

After a hard battle that lasted two days, they finally fought their way out.

As a Verb

struggle hard; struggle arduously

2
wéi
kǎo
xué
大学
jīngcháng
经常
tōngxiāo
通宵
zhàn
苦战
  

He often worked throughout the night in order to be able to pass the college entrance examination.