Market insiders reckon that firms such as Shell and Lufthansa routinely trade more than their commercial needs would justify.

市场业内人士认为，像壳牌和汉莎那样交易额一般都超过其商业需求的公司能说明这个问题。

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The hawksbill turtle possesses a beautiful marbled shell, which has been exploited for thousands of years as the sole source of commercial tortoiseshell.

玳瑁海龟拥有漂亮的花纹龟壳，几千年来一直是商业龟甲的唯一来源。

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Qt started as a commercial embedded tool kit and became extremely well known as the foundation for the KDE desktop shell.

Qt一开始是一种商业性嵌入工具箱，后来它成为了极其有名的、KDE桌面shell的基础。

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The commercial players are companies like Shell and Marathon, as well as users like Southwest Airlines.

FORBES: A Challenge: Stop Saying 'Speculators'

If all goes well, Shell could move forward with a commercial operation by the end of the decade.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale