"弥撒升阶圣歌集" can be translated into English as "Mass Gradual Hymnal" or more precisely, "Collection of Mass Graduals".
Here's a breakdown:
"Mass" refers to the liturgical service in the Catholic Church.
"Gradual" (or "Graduale" in Latin) specifically denotes the musical or chanted part of the Mass that occurs after the Epistle (reading from the Bible) and before the Gospel. It's a type of hymn or chant.
"Hymnal" or "Collection" implies a compilation or book of such hymns or chants.
In a more technical or liturgical context, "Collection of Mass Graduals" might be more appropriate, as it directly refers to the compilation of the Graduals used in the Mass. However, "Mass Gradual Hymnal" could also be understood, especially in a more general or musical context.