A trader buys a stock or foreign exchange in one market and sells it immediately in another market for risk-free profit.

某商人在一市场买入股票，外汇等，即出手将其在另一(叫价高的)市场卖出，从中套得‘无风险’的利益的。

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The idea quickly spread, and Todd made a wise decision to set up Little Free Library as a non-profit organization with signs that read "Little Free Library: Take a Book, Return a Book."

这个想法很快传播开来，托德做出了一个明智的决定，把小小免费图书馆创立为一个非营利组织，其标志上写着“小小免费图书馆：取走一本书，还回一本书”。

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Once websites became avenues for profit, the free exchange that was once the WWW became more of a closed, commercial space.

一旦成为了网站变成了盈利的途径，变成了商业空间，自由交流在WWW会变的更加封闭。

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An interest rate of just over 4% on yuan deposits compared with 2% on dollars, combined with an expected appreciation in the yuan, offers a seemingly risk-free profit for those who can get money into China.

ECONOMIST: Capital inflows to China

If you are a fan of reality TV, you have probably noticed an overabundance of house-flipping shows, and each show paints a picture of a little hard work followed by nearly risk-free profit for those who endure.

FORBES: Are Distressed Homes Worth Buying?

If one is in a socialist system, individuals and companies are either not free to own and profit from their work or innovation, or they are on path to not being free to own and profit from their work or innovation in the near future.

FORBES: Opposing "The Verge" of Socialism