If something such as an event is a watershed in the history or development of something, it is very important because it represents the beginning of a new stage in it.
①The election of Mary Robinson in 1990 was a watershed in Irish politics.
②Tonight could prove to be a watershed for the international career of Barnes.
《金融时报》一篇题为《China's record purchase of corn a 'watershed moment'》也出现了这个表达：
这也是一个很好用的写作词汇，表示“关键时刻，转折点”，可以替代我们经常说的：turning point, milestone
To make someone gradually stop depending on something that they like and have become used to, especially a drug or a bad habit.
①Children should be weaned off television.
②It's two years since I've seen Iain. I'm still trying to wean myself off him but it's hard.
《金融时报》一篇题为《A race to vaccinate the developing world》也出现了这个表达：
这是一个外刊中的高频表达，单词 wean 的原义是“给 (婴儿或幼崽)断奶 ”
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