这其实是二十世纪很有用的发明之一。在箱内形成负压，使人不由自主扩张胸腔吸气，箱内压力增大的时候又会不由自主呼气。在铁肺的辅助下，危重病人可以在一定程度上自主呼吸，箱内也可以配合用药起到治疗效果，对于肌肉萎缩无力无法自主呼吸的脊髓灰质炎患者有一定辅助作用。除了太占地方，效果不太稳定，可能会有噪音的话没有太大缺点，所以前些年还有人在使用。
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This is just a random comment. The former practice in many elementary schools of beginning the detailed study of American history without any previous knowledge of general history limited the pupil’s range of vision, restricted his sympathies, and left him without material for comparisons.