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I wrote the keywords of the following program with latex, but I can't display them. What is the reason?
The answer is as follows:

You didn't call the abstract macro package, or you just need to add \usepackage{abstract} in front of it.

emulsion

Latex (transliteration of latex) is a typesetting system based on τ ε χ, which was developed by American computer scientist Leslie Lamport in the early 1980s. With this format, users can give full play to the powerful functions provided by TEX even without knowledge of typesetting and programming, and can generate many book-quality printed materials in a few days or even hours. This is especially prominent for generating complex tables and mathematical formulas. Therefore, it is very suitable for generating scientific and mathematical documents with high print quality. The system is also suitable for generating all other types of documents from simple letters to complete books. [ 1]

Chinese name

Latek

Foreign name

emulsion

attribute

Typesetting system

developer

American computer scientist Leslie Lambert

Program debugging time

In the 1980s.

Applicable category

Typesetting of Large Files and Input of Mathematical Formulas

translate freely

Official Name: Latex

Plain text name: LaTeX

abstract

LaTeX uses TeX as its formatting engine, and the current version is LaTeX2ε.

LaTeX developed by Leslie Lamport is the most popular and widely used TeX macro set in the world today. It is built on the basis of ordinary TeX, adding many functions, making it easier for users to use the powerful functions of TeX. There is basically no need for users to design their own commands and macros when using LaTeX, because LaTeX has already done it for you. Therefore, even if users don't know much about TeX, they can generate high-quality documents in a short time. LaTeX is better at generating complex mathematical formulas. LaTeX has been developing continuously since it came out in the early 1980s. The original official version was 2.09. After several years of development, many new functions and mechanisms have been introduced into latex. While enjoying the convenience brought by these new functions, its side effects are beginning to appear, that is, incompatibility. The standard LaTeX 2.09 introduces LaTeX, SLiTEX and AMS-LaTeX of the new font selection framework (NFSS), which are incompatible with each other, causing great trouble to users and maintenance personnel. In order to end this bad situation, FrankMittelbach and others set up the ATeX3 project team with the goal of establishing an optimal, effective, unified and standard command system. That is to get a new version of LaTeX. 3. This is a long-term goal, and the first step towards this goal is LaTeX2e released by 1994. LaTeX2e adopts NFSS as the standard, which adds many new functions and is also compatible with the old LaTeX 2.09. LaTeX2e is updated every 6 months. LaTeX2e will be standard until the found errors are corrected and added [2].