问题描述：
英语翻译
The hierarchy of medical occupations is in many ways a --------system ; its strata remain--------and the practitoners in them have very little vertial mobility.
caste-------intact
The hierarchy of medical occupations is in many ways a --------system ; its strata remain--------and the practitoners in them have very little vertial mobility.
caste-------intact
问题解答：
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