Good afternoon Questionsfromtaiwan,
Welcome to the Apple Support Communities!
I understand you have Voice Memo recordings on your iPhone that you want to copy to your computer. If you have a Mac computer, and can upgrade to macOS Catalina, you will find the Voice Memos app is automatically installed. You can sync all of your Voice Memos at once by enabling this new iCloud feature.
See your voice memos on all your devices - Voice Memos User Guide
If you don't have macOS Catalina installed, you can send Voice Memos from your iPhone to your Mac via AirDrop or save them to iCloud Drive.
Share a recording in Voice Memos on iPhone - iPhone User Guide
If your computer is a Windows PC, you can download iCloud For Windows and access the voice memos from iCloud Drive.
Set up iCloud Drive
Use the Voice Memos app
Set up iCloud on your Windows PC
Take care.