Definition: to warn someone of something Level: C2
医生警告病人不要吃太多糖。
The doctor ___cautioned the patient against eating too much sugar.
父母应该被警告不要让孩子过度使用社交媒体。
Parents should be ___cautioned about letting their children use social media excessively.
她警告她的朋友地板很滑。
She ___cautioned her friend about the slippery floor.
