四试，读音sì shì，汉语词语，意思为古代诸侯、州伯定期考核官吏的制度；指科举中的四级考试。出自汉·董仲舒《春秋繁露·考功名》。
实验的第二阶段发生在四个月之后，这些被试被不同的实验者联系，为了防止被试受第一个实验的干扰，他们被告知这是不同的实验。
The second stage of this experiment took place four months later when the participants were contacted by a different experimenter apparently about a different study - of course this was just a ruse.
在超过两年的时间内的四个不同时期下对被试的抑郁发作，抑郁症状，睡眠质量和慢性内科疾病进行评估。
The participants were assessed at four different times over a two-year period for depressive episodes, depressive symptoms, sleep quality and chronic medical disease.
组织方将于四月份举办四场世博试展，以把可能出现的风险降至最低。
The World Expo organizers will hold five trial operations in April to minimize the possibility of things going wrong.
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