Maybe you spend your free time managing a flower bed in the park – why not put a little wooden freewill donation box out there for people to drop a coin in?

如果你的业余时间是在给公园的花坛干活——那为什么不弄一个捐助箱，让人们投点钱呢？

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Sunshine is free. None of the human beings in the world can survive without sunshine. However, who has ever paid a coin for the sunshine he or she enjoys?

阳光，是免费的。芸芸众生，没有谁能离开阳光活下去；然而，从小到大，可曾有谁为自己享受过的阳光支付过一分钱？

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Now the equipment, built under a microscope, is the size of a coin and can be planted under the scalp and so is unnoticeable in a free-moving subject.

现在的设备，是在显微镜下制造的，尺寸只有一枚硬币大小，并且能被植入于头皮下，所以是不容易被自由移动的对象所发现。

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In some instances, it can be as basic as providing free coffee and Wi-Fi or, in the case of TD Bank, free coin-counting at "Penny Arcade" machines.

WSJ: Banks Try to Lure Customers Back to Branches

Participants could pay to see the predictions in advance, but they saw them free after the coin toss had occurred.

ECONOMIST: Buttonwood