deckchair
noun [ C ] uk/ˈdek.tʃeər/ us/ˈdek.tʃer/
折叠躺椅;（尤指）沙滩椅
a folding chair for use outside, especially on the beach, on a ship, or in a park, with a long strip of material that forms a low seat when the chair is open
Idiom
shifting/rearranging the deckchairs on the Titanicidiom 舍本逐末；浪费时间处理琐碎事情而忽略了关键问题
used for saying that someone is wasting time dealing with things that are not important, and is ignoring a much more serious problem