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VOA慢速英语:新研究发现天鹅座X-1黑洞可能比预想更大
2021-02-28来源:和谐英语
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bet – n. an agreement in which people try to guess what will happen and the person who guesses wrong has to give something (such as money) to the person who guesses right; a wager
source – n. the place where something starts from
wager – n. an agreement in which people try to guess what will happen and the person who guesses wrong has to give something (such as money) to the person who guesses right; a bet
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