A few such studies have been done in the past, but each time with a tiny sample of one or two patients.
过去已经进行过一些类似的这类研究，但是每次都只抽查了一到两名患者。
It was taken by James Clerk Maxwell by photographing the ribbon three times - each time with a different color filter over the lens.
它是由詹姆斯·克拉克·麦克斯韦通过三次拍摄同一缎带得到的-每次在镜头上用不同的彩色滤光片。
He had tried on six separate occasions to make this image following seasonal rains, dissatisfied each time with the quality of the reflections in the standing water.
为了这张照片的效果，Jack Dykinga已经在6个不同的时间试着拍摄季雨到来时的影像，但是每次对水中的倒影却都不甚满意。
Due to the challenging nature of the project, the development process had to be completely restarted twice within the project's first nine months, each time with a different head programmer.
由于该项目的难度，开发过程中前九个月有两次必须彻底重新开始制作，而每次都换了一个主程序员。
It seems some sinking is iterative, where a location sinks and then rises again, then sinks again, each time with a greater permanent loss of elevation.
貌似有些下沉是反复的，某个区域下沉然后又上升，又下沉，每次都会失去更多的海拔。
Lady Blemley returned each time with an expression of listless depression.
布莱姆利太太每次回来都是垂头丧气的。
Lady Blemley returned each time with an expression of listless depression.
布莱姆利太太每次回来都是垂头丧气的。
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