1. be on duty 值班,值日,在上班时% W, v4 \2 v8 d! w3 v) A
2. be in duty bound to (do)(=be required by one‘s job or esp. by conscience)有义务(做)) \, d. K9 B2 J
3. be eager for 想得到,盼望 0 G; C& r( H! s 4. by ear (=play music from memory without having seen it printed)凭记忆,不看乐谱 3 {9 w* j; r4 Q$ p. X 5. have an ear for (=have keen recognition of sounds esp. in music and language)对……有鉴赏力 8 `2 l" ], k; t 6. a word in one‘s ear 私房话,秘密话6 D( Q+ I4 a3 J4 Z; i8 v
7. on earth 究竟,到底,全然: r- s* i+ E4 G* f& m8 A5 D- n |7 b4 L8 L
8. with ease ( = easily)容易,不费力! C% {& u& J4 ?' l& i( ~
9. at (one‘s) ease ( = without worry or nervousness)自在,不拘束 ! j- R0 ?) U A9 k0 | 10. put sb. at his her ease (=free sb. from worry or nervousness)使某人感到无拘束