Describe a happy time in your childhood

You should say:

What is it

When did it happen

Why you remember it

故事线：我童年时最甜蜜的回忆之一是我第一次学会骑自行车，我非常高兴能有这样的经历。

高分语料：After riding for a couple of days behind my brother, I wanted to learn to ride it myself. My brother, Jim, did not hesitate to teach me the riding. Initially, he explained how bicycle worked and took me to take the rider seat. I fell on the ground several times and Jim instructed me to keep the balance. In the first phase, Jim used to control the bicycle from behind so that I do not fall on the ground and gradually I improved in riding the bicycle. Later, Jim allowed me to ride the bicycle alone.