我从口袋里掏出一枚硬币，把它投掷出去。
你可以说概率是你投掷一个硬币，出现正面的机会是一半，因为出现正面和背面的机会是相等的。
You might say the probability that you toss a coin and it comes up heads is a half, because it's equally likely to be heads and tails.
你还记得：在一个移动带上有数千个2便士硬币摞成摞，你必须投掷自己的硬币，并希望它会导致那些成摞的硬币被击倒，这样你就能悉数归拢这些硬币了。
You remember: thousands of two pence coins lie on a moving shelf, and you have to drop in coins of your own in the hope it will cause the pennies to tumble down for you to collect.
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