Post-processing the text of only letters and numbers for higher-order data is a much easier method of developing a useful annotation system with available open source systems.
要使用开源系统开发实用的注释系统，对只有字母和数字组成的文本进行后处理以获得更有条理的数据，这种方法更加简便。
Field names can contain only letters, Numbers, or the underscore character.
字段名称只能包含字母、数字或下划线字符。
Text that includes ONLY letters, digits, and the following characters: _-.
仅包括字母，数字和这些字符： _-。
Text that includes ONLY letters, digits, and the following characters: _-.
仅包括字母，数字和这些字符： _-。
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