How to scroll back in Vim's built-in terminal?

Hello,
I am using Vim's built-in ":terminal", it works well.

However, I found it is impossible to scroll back in this terminal.

I have tried several terminal emulators and Gvim. But none of them can let me scroll back in terminal opened by ":terminal" command.

I tried SHIFT+PgUp and Ctrl+Shift+UP, both failed. And I don't find any information about scroll back in ":terminal" in Vim's document.

Is there any way to scroll text in Vim's ":terminal"?

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