Chris says that his parents " improvised all the time, " meaning frequently, " using what was on hand (hand) to make repairs." " On hand" means what is available and ready to use right now.

克里斯说他的父母“一直在即兴发挥” ，意思是经常，“使用手头（手头）的东西进行修理。 ” “手头” 是指现在可用和准备使用的东西。