本期内容：
It is an "open question" whether or not US athletes will participate in the 2018 Winter Olympics in South Korea amid rising tensions with North, the US ambassador to the UN has said. Nikki Haley told Fox News that the US would take "every precaution" to ensure the safety of its athletes.The Games will be held in Pyeongchang, just 50 miles from the border that separates the North and South.

open question: 悬而未决的问题
amid：在……之中
rising tensions：不断升级的紧张局势
ambassador：大使
precaution：小心谨慎

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