She plays in the park with her childhood sweetheart.

她和她的青梅竹马在公园里玩耍。

He has always considered her his childhood sweetheart.

他一直把她当作自己的青梅竹马。

She is betrothed to her childhood sweetheart.

她已跟那青梅竹马的男朋友订了婚.

He seems happily married to his childhood sweetheart, Svetlana, with whom he has one son, Ilya.

他似乎和青梅竹马的心上人婚姻美满，有一个儿子。

He seems happily married to his childhood sweetheart , Svetlana, with whom he has one son, Ilya.

他似乎和青梅竹马的心上人婚姻美满, 有一个儿子.