[译] 医生限制该病人一天抽两支烟。
[误] The doctor restricted the patient to smoke two cigarettes a day.

[正] The doctor restricted the patient to smoking two cigarettes a day.
[注] restrict的意思是keep within limits，它常与介词to连用，表示限制的范围，所以to后面可以跟名词或动名词，而不能跟动词不定式。