WSL is consuming massive memory in my disk

[laurence-lin]

• Your Windows build number:
• Microsoft Windows 10
• Linux type: Ubuntu-18.04
• What you're doing and what's happening:
• I just start using WSL today (Not WSL 2), and after several hours since I start monitoring on the Linux subsystem, I check up the remain memory of my disk C, it's 130 GB left.
• What's wrong / what should be happening instead:
• After several hours later I work on Linux, in this process I had installed some python packages, and try to run some program. After I check up the remain memory on disk C, it shows only 128 GB left.

I'm sure the packages I installed don't cost this large memory, most of the time I was trying to run the program. I wonder is this the temporary file saved while I'm using Linux?
I haven't even really start to work on Linux right now, and the consuming memory space is terrible that I'm afraid the disk might be full if I use WSL longer.
What's wrong with the memory consuming in WSL?