Some pretext to introduce the topic at hand. Basically a short preamble.
What is this topic?
the quick brown fox jumps over the little lazy dog. the quick brown fox jumps over the little lazy dog. the quick brown fox jumps over the little lazy dog.
Good references:
https://steelconstruction.info/images/5/57/SCI_P324.pdf
http://www.kouriki-bolt.jp/qa/faq
https://reno-happia.co.jp/20240701kanagawa/