I left Alexandria next day, and I forgot about Abraham till a little while ago, when I was dining with another old friend in the profession, Alec Carmichael, who was in England on short leave. I ran across him in the street and congratulated him on the knighthood with which his eminent services during the war had been rewarded. We arranged to spend an evening together for old time's sake, and when I agreed to dine with him, he proposed that he should ask nobody else, so that we could chat without interruption. He had a beautiful old house in Queen Anne Street, and being a man of taste he had furnished it admirably. On the walls of the diningroom I saw a charming Bellotto, and there was a pair of Zoffanys that I envied. When his wife, a tall, lovely creature in cloth of gold, had left us, I remarked laughingly on the change in his present circumstances from those when we had both been medical students. We had looked upon it then as an extravagance to dine in a shabby Italian restaurant in the Westminster Bridge Road. Now Alec Carmichael was on the staff of half a dozen hospitals. I should think he earned ten thousand a year, and his knighthood was but the first of the honours which must inevitably fall to his lot.

这一句I remarked laughingly on the change in his present circumstances from those when we had both been medical students中from those 理解困惑：

上面提问的句子和牛津例句类似：The courts view him in a different light from that of a manual worker. (from that)

2句类似，from those/that

1)those或that都是指代前面提到的某个东西吗？怎么理解这个指代的东西在前面和后面都出现 - 是同一个东西吗？逻辑上怎么理解呢？

这里可否用ones或one？

2) from those/that 前其实是否是一个省略的定语从句: 先行词+which were from those of 或先行词+which is from that of ... 这种理解对吗？