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以上来源于: WordNet
When kept at a proper length, nails can be useful in many ways, including acting as a barometer of a person's health.
如果被修剪成适当的长度，指甲也会有很多的用途。例如，指甲可以作为健康的晴雨表。
Results showed that the proper length of time for the treatment ranged from 30 to 180 min.
合适的负压处理时间在30～180分钟之间，具体应根据需要解离材料的来源和细胞状态而确定。
To pursue the proper length ratio range of the mechanism, an optimization design mathematic model is made and an example is taken to prove the feasibility of the model.
为了寻求合理的进给机构杆长比范围，建立了优化设计数学模型，并通过实例验证了该模型的可行性。
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