Objective: To reveal a particular type of dependence by a contingency table.
目的反映由列联表所揭示的特殊类型的相关。
Objective: to observe the protective effect and mechanism of Yishi-table on retinal photo damages.
目的：观察益视片对视网膜光损伤的防护作用，并探讨其作用机理。
Objective: to observe the protective effect and mechanism of Yishi-table on retinal photo damages.
目的：观察益视片对视网膜光损伤的防护作用，并探讨其作用机理。
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