Untitled

R Markdown

在这里写简介介绍，不用任何的记号，直接写，全文结束后用Knit生成页面 凡是白体字都是直接显示的，在这里#不表示注释（在代码块中可以```），在这里用

Life expectancy

How has the life expetancy in the following countries

Germany United States *Japan

changed over time?

## Warning: package 'gapminder' was built under R version 4.5.2

## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
## ✔ dplyr     1.1.4     ✔ readr     2.1.5
## ✔ forcats   1.0.1     ✔ stringr   1.5.2
## ✔ ggplot2   4.0.0     ✔ tibble    3.3.0
## ✔ lubridate 1.9.4     ✔ tidyr     1.3.1
## ✔ purrr     1.1.0     
## ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
## ✖ dplyr::filter() masks stats::filter()
## ✖ dplyr::lag()    masks stats::lag()
## ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors