以下为句子列表：
英文: As the crowd watched in stunned silence, Kupfer showed them image after image of proteins organized into bull's-eye patterns at the area of contact between the cells.
中文: 在场的听众鸦雀无声，而库普夫则是透过一张又一张的影像指出，在免疫细胞互相接触的区域，蛋白质结构严谨地排列成靶心的样式。
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英文: The bull's-eye patterns seen around planetary nebulae come as a surprise to astronomers because they had no expectation that episodes of mass loss at the end of stellar lives would repeat every 1,500 years.
中文: 这个牛眼样的图案出现在行星式星云四周让天文学家很吃惊，他们不可能期待1500年，在他们有生之年只能看到片断。
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