2）长选项（long options）：长选项，包含了两个连字号和一些大小写字母组成的单词。例如，--size，--help等。
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... -o,o user-defined 可以输入自己的参数 long options 长操作类型 misc options 其他选项 ...
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long options contract 期权长仓合约
Long options contract p 期权长仓合约
long only brokers for options 只限长仓
Mandatory arguments to long options are mandatory for short options too.
对于长选项必须的参数，对于短选项也是必须的。
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长选项的强制参数同样也是短选项的强制参数。
We need to take a long hard look at all the options.
我们需要十分谨慎地考虑所有的选择。
《牛津词典》
Shareholders own shares outright, whereas corporate executives are long call options.
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Energy stocks have remained one of the most fertile long term options throughout the recession, as companies have benefited from increased access to resources both domestically and abroad (until the recent moratorium).
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It is considering feedback from its consultation with traders and a number of long-term options.
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