基于用户提供的关键词，从新闻文章中提取相关段落。


keywords = "COVID-19 vaccine"
news_article = "The COVID-19 vaccine is currently being developed and tested..."
1. TODO: 从新闻文章中提取包含提供的关键字的段落。
从新闻文章中提取包含提供的关键字"Covid-19 vaccine"的段落。

One possible extracted paragraph: "Scientists around the world are currently racing to develop a Covid-19 vaccine as the pandemic continues to ravage communities worldwide. Several vaccine candidates have entered clinical trials, but it's still unclear when a safe and effective vaccine will be available to the general public. In the meantime, governments and public health officials have emphasized the importance of continued social distancing, mask-wearing, and other preventative measures to slow the spread of the virus."