A player retires only if his employer will no longer want to sign a contract with him and he is not claimed from the free agents market by any team.

一名球员退役，只有当他的雇主将不再想与他签订合同并且在自由市场上没有一支球队需要他。

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Volatility in raw material prices, along with stringent rules and regulations related to food & beverage packaging films are restraining the growth of the antistatic agents market.

食品和饮料包装薄膜相关的严格法规，原料价格的不稳定性，抑制抗静电剂市场成长。

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That shift, in turn, place an unprecedented premium on "knowledge workers", a new class of wealthy, educated, and mobile people who view themselves as free agents in a seller's market.

反过来，这种转变又给“知识工人”带来了前所未有的好处，这是一个新的阶层，由富有、受过教育、流动性强的人组成，他们认为自己是卖方市场上的自由代理人。

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Real-estate agents consider a market balanced when there is a six-month supply of homes for sale.

WSJ: Stunned Home Buyers Find the Bidding Wars Are Back

"Today, the NFL and its agents continue to market the ferocity and brutality of the sport, " the suit said.

CNN: January 23, 2013 -- Updated 2220 GMT (0620 HKT)

Professor Piddock pointed out that 16 new antibacterial agents were approved and brought to market between 1983-1987, compared with less than four agents since 2008.

BBC: Action on antibiotics