(1) About average

　　　 — no better or no worse than others.

　　　 — 符合一般水平

　　　 Example: Some staff's performance is about average. They have never proved better.

　　(2) About time

　　　 — the appropriate time.

　　　 — 差不多到时候了

　　　 Example: You have been working for quite a while. It's about time you had a new car.

　　(3) About to

　　　 — ready to

　　　 — 即将；正要

　　　 Example: We were about to go out when it suddenly rained.

　　(4) Back to back

　　　 — with the back facing the other.

　　　 — 背靠背

　　　 Example: Stand back to back, boys! Let me see who is the tallest.

　　(5) Back to front

　　　 — with the back placed where the front should be.

　　　 — 前后颠倒

　　　 Example: You got your pullover on back to front.

　　　 — thoroughly

　　　 — 透彻地

　　　 Example: All the people here know the government's major policies back to front.

　　(6) Back up someone/something

　　　 — support someone/something.

　　　 — 支持某人／某事

　　　 Example: ① No matter how, we should back up our most respected representative.

　　　　　　　　② Some new evidence backed up the prosecutor's argument.

　　(7) Call on/upon someone

　　　 — visit someone

　　　 — 访问某人

　　　 Example: When are we going to call on our new neighbours?

　　(8) Call on/upon someone to do something

　　　 — invite someone to speak, etc.

　　　 — 邀请

　　　 Example: Without further ado, let me call upon our distinguished guest to speak to us.

　　　 — appeal to someone to act.

　　　 — 恳求；促使

　　　 Example: In times of difficulties, we will have to call on the public to make donations.

　　(9) Call out someone

　　　 — order officially.

　　　 — 召唤

　　　 Example: During the riot, the chief of police had to call out the riot police to restore law and order.

　　(10) Damp(en) something down

　　　 — make a fire burn less strongly.

　　　 — 使火燃烧缓慢下来

　　　 Example: It was a moonlit night, so the campers dampened down the fire.

　　　 — control and reduce something; suppress something.

　　　 — 抑制；减弱

　　　 Example: ① Some boys were over-zealous and we had to damp down their enthusiasm.

　　　　　　　 ② Lack of support has damped down political dissidents' activities.

　　(11) Dance attendance on/upon someone

　　　 — do what someone wants without asking.

　　　 — 侍候某人，听其差遣

　　　 Example: The manageress sat still, expecting everyone to dance attendance on her.