Ten times a day, they extract the 10-foot long cylinder of compressed ice crystals that contain the unsullied air and trace chemicals laid down by snow, season after season for thousands of years.
每天十次，他们提取 十英尺长的压缩冰晶柱 其中包含了 在经过了上千年的历史更迭之后雪层下 未经污染的气体和轨迹化学物。