What does it mean to wander back to greener grass with a long pole?

Supporting a long pole and swimming back to the greener grassland means going upstream and moving to a certain target at will in the water;

The original text is as follows:

I left quietly, just as I came gently; I waved my hand gently and bid farewell to the clouds in the western sky.

The golden willow by the river is the bride in the sunset; Beautiful shadows in the waves ripple in my heart.

Green grass on the soft mud, oily, swaying at the bottom of the water; In the gentle waves of He Kanghe, I would like to be a water plant;

That pool under the shade of elm is not a clear spring, but a rainbow in the sky; Crushed in floating seaweed, a rainbow-like dream is precipitated.

Looking for dreams? Support a long pole and swim back to a greener place on the grass; Full of starlight, singing in the splendor of starlight.

Back to greener grass; Full of starlight, singing in the splendor of starlight. But I can't play the piano, just a farewell flute; Summer insects are also silent for me, silence is Cambridge tonight!

Extended data:

This poem was written by Xu Zhimo on his way home after his third trip to Europe. The time is1928165438+10. The place is China. One summer at the end of July, after staying at the home of the British philosopher Russell for one night, a man quietly came to Cambridge to find his English friend without any notice in advance.

Unfortunately, none of his English friends are here, only Cambridge, which he is familiar with, is waiting for him silently. The scene of his past life reappeared before his eyes ... because he was in a hurry to meet another English friend, he didn't record this emotional activity. It was not until he left Marseille by boat on his way home, facing the rough sea and the vast sky, that he unfolded the paper and wrote down his personal feelings about returning to Cambridge this time.