add in
1. 把……包括在内
If there is going to be a volleyball team, please don't forget to add me in.
要是成立排球队, 请别忘了把我算在里面。
add up
1. 把……加起来
Add up 3, 4 and 5 and you'll get 12.
把三、四、五相加, 总数是十二。
add up to
1. 总计达
The bills add up to exactly $100.
这些帐单加起来正好一百元。
2. 意味着
His evidence really adds up to this: he didn't murder the man.
他的证据实际上意味着:他没有谋杀那个人。