When life gets tough, you can become tougher.

生活不会更容易，但你可以更强大。

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The market is constantly changing and selling conditions have become tougher.

在市场形势在不断变化，销售形势变得越来越难。

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The airline business is volatile and has become tougher for mainstream airlines since 2001.

航空业务波动性大，自2001年以来，主流航空公司的经营更为艰难了。

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Secretary Geithner told the House Financial Services Committee Thursday that it has become clear there is a need for better and tougher regulation in a complex and flawed financial system.

VOA: standard.2009.03.26

"The discussions with Iran have become tougher, a bit more unpleasant, " said Germany's ambassador to the United States, Juergen Chrobog.

CNN: Could move closer to U.S. position on sanctions

"Manufacturers had hoped that life was going to get easier but instead it has become tougher, " said the CBI's head of economic analysis Doug Godden.

BBC: UK manufacturers' confidence slumps

As business and marketing environments have become tougher, it's true that those companies that have found out what the king wants -- and provided it -- have been successful.

CNN: Who's king -- customer or employee?