1970, milions of Americans concerned about the environment observe the first “Earth Day”. The demonstration becomes an annual event that’s now observed around the world.
observe v.注意到，观察到；注视，监视；（在科学研究中）观测，发现；说话，评论；遵守（规则、法律等）；庆祝（节日），纪念（某人或事件）；静默，默哀；举行，参加
demonstration n.演示，展示；游行，示威；证实；表达，表露
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