如何在摘要下面显示关键字？

Question

我在.Rmd文件中定义了关键字，但是它们在输出PDF中是不可见的。

电流输出

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预期结果

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电流.Rmd

.Rmd文件的第一行如下所示：

---
title: "No keywords within the output file"
abstract: "This is sample text for abstract. Generally speaking, I would like to show keywords list below an abstract (as in case of the linked example)"
keywords: "keywordA, keywordB"
author: "Mateusz Kędzior"
output: 
  bookdown::pdf_document2:
    keep_tex: true
    number_sections: yes
    toc: false
base_format: rticles::elsevier_article
---

```{r setup, include=FALSE}

knitr::opts_chunk$set(echo =真)

## Elsevier article

This is an R Markdown document.

I'm trying to prepare an Elsevier article. 

Answer 1

我想知道base_format在您的示例中是否真的做了任何工作(输出与base_format和不带base_format的情况相同)。由于base_format是pdf_book的一个参数，请考虑将YAML头更改为

---
title: "No keywords within the output file"
author: 
- name: "Mateusz Kędzior"
abstract: "This is sample text for abstract. Generally speaking, I would like to show keywords list below an abstract (as in case of the linked example)"
keywords: "keywordA, keywordB"
output: 
  bookdown::pdf_book:
    keep_tex: true
    number_sections: yes
    toc: false
    base_format: rticles::elsevier_article
---

它提供了以下输出：

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或者，在摘要中添加关键字：

    abstract: "This is sample text for abstract. Generally speaking, I would like
 to show keywords list below an abstract (as in case of the linked example) \\par
 \\textbf{Keywords:} a, b"

要获得

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