人群再次排队观看最新科技，会见研究人员中国最高的自然科学学术机构周末向科学爱好者敞开大门，分享最新的科技成果，以普及科学为目标，让公众与著名科学家和关键研究机构接触。中国科学院于周六启动了第19个公共科学日活动，向公众开放了100个研究机构

Between the preparation and the work, the apprenticeship（学徒期） and the actual dealing with a task or an art, there comes, in the experience of many young men, a period of uncertainty and wandering which is often misunderstood and counte