order 7 title zh-CN en-US 仅描述 Description only zh-CN 当不设置 nzTitle 时，仅展示描述。描述会固定显示在横线下方，不会与步骤条重叠。 en-US When nzTitle is not set, only the description is shown. The description always renders below the horizontal line and does not overlay the step bar.