Leave the code as it is (no arg test inside calculate).
保持此代码不变(calculate中没有arg测试)。
If no arg is given, it displays all defined error messages.
如果不给出参数，则它会显示所有定义的错误消息。
Analysis of amino acid composition of LPL shows that it has a high content of acidic amino acid, a few of basic amino acid but no Arg.
氨基酸组成分析表明，该凝集素富含酸性氨基酸，而碱性氨基酸含量较少，不含精氨酸。
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