"How dare I open its screen easily?" Personally, I think it's "years". In retrospect, I dare not touch the wound again (losing my mother).
"I dare not show the sacrifice of love in this way" means that I love too much and can't let others know, and I bear it silently.
"It's a dry well that can't sing in the shade of flowers and trees." After my mother died, I lost the opportunity to express my love, so it's a dry well that can't sing.
I feel that the "mother" inside is an image itself, which may be a "country"
Wait a minute. So the feelings are complicated and the poems are beautiful!