add up
1．put together加起来
Add these figures up and see what the total is．把这些数字加起来，看看总数是多少。
The numbers wouldn't add up．这些数字加起来与总数不符。
2．assess； help估计；权衡；有所帮助
They added up all the advantages and disadvantages and tried to come to a decision．他们权衡了所有的利弊得失，试图做出决定。
Doing morning exercise every day will add up．天天做早操有益于健康。
3．make sense；present a reasonable picture有意义；合情合理His excuse just doesn't add up．他的借口简直没有道理。
Nothing he does seems to add up．他的所作所为似乎没有意义。
His story didn't add up．他的故事不合情理。