precise [prɪˈsaɪs]

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adj.精确的，恰好的，极清楚的

exact and accurate

At that precise moment, Miss Pulteney came into the office. 恰恰在那个时刻，普尔特尼小姐走进了办公室。
A scientist must be precise in making tests. 科学家做试验必须精确。