小琳子雄霸天下
住院 in hospital 在医院 in the hospital(这里加定冠词,强调的是在医院,可以是去看病,也可以不看病只是去看病人,只说明你去了医院。)

karenchao1983
住院:in hospital It is the custom to bring chocalates or fruit when visiting a patient in hospital. 在医院:at the hospital I was working at the hospital.
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