求翻译：取其中一条在标准条件下进行暗室处理。将测得的密度值（选择曝光参数时，应保证其密度值达到2.0±0.30）作为基准密度值。将其余几条已曝光胶片装入暗盒妥善保存备用。（注：此控制胶片必须存在一黑度范围为2.0-2.5的值。）是什么意思？

Take one of the standard conditions for darkroom processing. The measured density values (when choosing exposure parameters, should ensure that its density value reaches 2 ± 0.30) as the baseline density value. The remaining few exposed film into cassettes keep spare. (Note: this control of film the

One of them under standard conditions for darkroom processing. The density value will be detected when parameters (select exposure should be assured that their density Value reaches 2.0 ±0.30 ) density value as the benchmark. The remaining few articles will be loaded into the cassettes have been unc

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Take one of the standard conditions for darkroom processing. The measured density values (when choosing exposure parameters, should ensure that its density value reaches 2 ± 0.30) as the baseline density value. The remaining few exposed film into cassettes keep spare. (Note: this control of film the

Take one of the standard conditions for darkroom processing. The measured density values (when choosing exposure parameters, should ensure that its density value reaches 2 ± 0.30) as the baseline density value. The remaining few exposed film into cassettes keep spare. (Note: this control of film the