Isolating these cells, which are capable of maturing into any other type of cell, marked a landmark in biology — but a controversial one, since the process destroys a human embryo.
他于1998年首次分离出人类胚胎干细胞，该细胞具有分化为任何其他类型成熟细胞的能力。
2
The German businessman Klein is the key figure and the Credit Agreement signed in 1936 is the landmark in this process.
德国商人克莱因与1936年的《信用借款合同》分别是这一历史进程中的关键性人物和标志性事件。
3
The writing process and the contents of the dictionary were a landmark and possess its own value in the cultural history of language in the Hei an Times.