1.ever before 以前 0 M# F) C& [, T 2.take/have an exam 参加考试 1 z9 @7 O C$ p, u1 o/ H: T 3.for example 例如 2 r, r* D" L& R1 h% I 4.set an example for sb.为… 树立榜样; t0 s( s; `' s+ C' v6 y# R
5.Please excuse me.请原谅。7 p V' I; \( X% D
6.excuse sb. for sth. 原谅某人某事 5 }1 a7 O7 ]& \# g 7.expect to do sth. 期待做… ) H3 v) \1 T' L P 8.experiment on sth. 对……进行实验0 o6 A0 p% {5 r! G" l
9.conduct experiment 做实验7 M0 U1 z, b" O* Y! G
10.explain oneself讲解,说明 给出理由