There are 10 candies in total, and the two take turns to take 1 or 2 of them. Whoever gets the last candy wins. Think about it: If you were asked to take it first, how many should you take the first time to ensure victory?
糖果一共有10颗，两人轮流从中拿走1颗或2颗，谁拿到最后一颗糖果谁就获胜．想一想：如果让你先拿，第一次应该拿几颗才能确保获胜？
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