斯蒂格勒博士和米勒博士都注意到了另一个差异，特别是在数学上。
Another difference, particularly in math instruction, stood out to both Dr. Stigler and Miller.
格勒·威利博士指出：“菠萝果心的菠萝蛋白酶含量可是外层果肉的两倍。”
"The core of a pineapple contains twice the bromelain concentration of the surrounding fruit," says Dr Glenville.
他还回忆起在列宁格勒国立大学修读法学博士时当打工族和扫雪工的情景。
Medvedev recalled working as a labourer and a snow sweeper while studying for a law PhD at Leningrad State University.
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