The answer is: "The beauty of dawn is short like the happy times in life that people should value."
In the poem "Nothing Gold Can Stay," Robert Frost considers dawn fresher and more colorful than the day. As a consequence, he makes reference to the beautiful gold color of the first leaves, which lasts only a short period of time, just like the beauty and happy times in life. After that, the day begins, leaves turn into an ordinary color green, and finally die when they fall down from trees.