Since two Americans set foot on the moon in 1969, lunar exploration has been a dream of many people.
自从两个美国人于1969年登上月球以来，探月成为许多人的梦想。

Steady progress has been made since China launched its “Chinese Lunar Exploration Program.”
自从中国实施“中国探月工程”以来，已经取得了稳步进展。