你是我年少是最冒险的梦
[nĭ shì wŏ nián shăo shì zuì mào xiăn de mèng]
The meaning is 'you were my most adventurous dream when I was young'. This suggests that 'you' are the boldest, craziest yet desirable thing that occurred during my teenage years or adolescence, like a thrilling and memorable dream.