1. In total, these astronauts have spent more than 26,000 days in space. 这些宇航员总共在太空呆的时间已经超过了26,000天。 in total是介词短语, 意为“总共, 合计”。 e.g. In total, there must have been 500 people there. I was with my grandpa for eight years in total.