Definition
If a situation does not add up, it means there is no logical or believable explanation for it, making it seem suspicious or unlikely.
说不通，不合理。
He claimed he was working from home, but he never answered his phone; it just doesn't add up.
他声称他在家工作，但他从未接过电话；这根本说不通。
She said she left her purse on the table, but now it’s gone; it doesn’t quite add up.
她说她把钱包放在桌上，但现在不见了；这有点说不通。
The numbers don't add up; we need to recheck all the data.
数字对不上；我们需要重新检查所有的数据。