The vaccine was significantly more effective … if they had not b

來源: ephd 於 2015-12-01 14:18:31 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (258 bytes)
本帖於 2015-12-01 14:19:42 時間, 由普通用戶 ephd 編輯

The vaccine was significantly more effective … if they had not been vaccinated in the previous five years.

這句話還不能說明問題嗎？ 應該好好想想是不是要年年都打疫苗，或者應該每5年打一次？

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