His first great discovery was made when he recognized a Cepheid variable star.

VOA: special.2009.04.29

The great discovery that Galileo and Newton made is that you don't need a force for a body to move at constant velocity.

伽利略和牛顿的伟大发现就是,物体不需要力来维持匀速运动

耶鲁公开课 - 基础物理课程节选

Other people quickly traveled to the area of the great Klondike River where the three had made the discovery.

VOA: special.2009.02.04