This is the 6807th most frequent Russian word.
yle
The word "yle" is not Russian; it may be a typo or belong to another language.
The word 'мель' (shoal) contains 'eль' which demonstrates the soft sound usage in Russian phonetics.
Этот тип звука называется "мягкий", и как пример: "слово 'мель'".
This type of sound is called "soft," and as an example: "the word 'mель' (shoal)".
Here, 'Yle' is used as a proper noun referring to the Finnish national broadcasting company.
Когда я был в Финляндии, я слушал новости по Yle.
When I was in Finland, I listened to the news on Yle.
In 'поле', 'е' is a letter producing a softening effect on the preceding consonant 'л'.