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When he was alone, he telephoned the hospital exchange and asked for Doctor Millington.
exchange n. (电话的)交换局
exchange n.交换, 调换, 兑换, 交流,
There have been numerous exchanges of views between the two governments.
vt.交换, 调换
They exchanged experience at the meeting.
ask for: 要求，请求
When the doctor answered the phone, Mr. Gilbert said he was inquiring about a certain patient, a Mr. John Gilbert.
certain：某一、某位，暗指说话人或说话对象可能对这人不太熟悉或不太清楚。
A certain person telephoned you while you were out.
A Mr. Wang is waiting to see you.
Then Dr. Millington asked the caller if he was a relative of the patient. "No," the patient answered, "I am Mr. John Gilbert."
relative: 亲戚
相对的 relative motion
Every one has his relative strengths and weakness.
