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1.take on 与（尤指实力比自己强的人）较量；接受……的挑战
例句：Democrats were reluctant to take on a president whose popularity ratings were historically high.
民主党人不愿与一位有史以来民众支持率最高的总统较量。
2.mainstream n. （思想或行为的）主流；主要倾向，主要趋势
例句：Animation has stopped being eye-candy for kids and geeks and become mainstream entertainment.
动画不再仅仅吸引小孩子和动漫迷的眼球，而成了主流娱乐方式。
