work upsth
—phrasal verbwithworkverbuk/wɜːk/us/wɝːk/
todevelopanemotionalorphysicalstatethat youfeelstrongly, after aperiodofeffortortime
激发，激起
Weworkedup arealappetiteclimbingin themountains.我们突然很想爬山。
It'sstrange, but I can'tworkup anyenthusiasmfor going on thistrip.很奇怪，这次旅行激不起我的任何热情。