1、Add the second total to the third.
把第二笔总额加在第三笔总额上.
2、The figures add up to 450.
这些数字加起来的总数是450.
3、We added up all the advantages and disadvantages and tried to come to a decision.
我们全盘估计了种种利弊,力图做出决定.
4、The bad weather added to the shipwrecked sailors’ difficulties.
恶劣的天气增加了失事船只的船员们的困难.