When typing information in the Commands window, note that some formats require spaces for the correct structure. This is especially true when entering values (for example, a lsup{3}) instead of placeholders.
在“命令”窗口中键入信息时，请注意，有些格式需要空格才能形成正确的结构。输入数值（如 lsup{3}）而非占位符时尤其如此。