Correct

虚存

/ xū cún / 
Strokes

Example

As a Noun

virtual memory

1
Xūcún
虚存
jìsuànjī
计算机

virtual memory computer

2
Xūcún
虚存
guǎnlǐ
管理

virtual memory management

3
Xūcún
虚存
cāozuòxìtǒng
操作系统

virtual memory operating system