01. account for
[1]说明(原因等);
EG: His illness account for his absence from school.他因病未能去上学。
That accounts for it.原来如此。
[2](将保管的款项)记账;[3]对……负责( answer for )。
02. add up to
[1]合计,总计(amount to ,count up to );
EG: These figures add up to 117.
[2]结果。