"用斜体字排字" can be translated into English as "set in italics" or "typeset in italic font".
"Set in italics" is a concise and commonly used expression in typesetting and publishing contexts.
"Typeset in italic font" provides a slightly more detailed description, specifying both the action (typeset) and the font style (italic).
Both expressions are correct and can be used interchangeably depending on the context and level of detail required.