This is the 19552nd most frequent Korean word.
양호
"양호" means "good" or "favorable."
Here, '양호' is used as a descriptor for the state of the student's grades, implying they are satisfactory.
그 학생의 성적은 양호하다.
The student's grades are favorable.
In this context, '양호' describes the general condition of someone's health as satisfactory or good.
건강 상태가 양호한 편이다.
The health condition is relatively good.
This use of '양호' indicates that the machine is operating in a satisfactory condition.