"A mountain bird and a fish are different roads, so goodbye is easier than goodbye" is a Chinese proverb, which means that different creatures like a mountain bird and a fish naturally have different homecoming and fate.

and "mountains and seas have their own return dates" is also a proverb, which usually means that time and space will naturally have their own home and arrangements, and people just need to let nature take its course.

Therefore, replying to "the return date of mountains and seas" can express the response to the above, and also express the understanding and respect for the laws of nature.