（3）根据观察方式的结构化程度区分： 结构观察(constructed observation)：按照一定的程序、采用明确的观察提纲或观察记录表格对现象进行的观察。通常，采用局外观察的方式，其观察内容是固定的。
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To compare triphone models under different observation densities in Chinese language, three models and their respective algorithms of training and recognizing are constructed.
为了比较汉语三音子模型在不同观测概率情况下的差异，本文构造了三种不同模型，及其训练和识别算法。
If the standard residuals are constructed by the statistic oft distribution, the critical values are variable which depends on the degree of observation freedom and the given significance levels.
若基于学生化分布构造标准化残差，其临界值可由观测自由度以及给定的显著性水平确定。
They were constructed instead on the basis of experience and observation, often as the result of trial and error.
而是根据经验和观察建造的，经常是不断摸索的产物。
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