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。03. allow for 1考虑到(take into consideration); 2原谅,体谅。 EG: You should allow for his youth. 你应当体谅他还年轻。04. arrive at *在表示“到达”的具体含义时,arrive at/in =get to =reach ;在表示“达成”等抽象含义时,只用arrive at或 reach。.05. ask