英和和英

to be related to

connection

the state of being connected

a close connection

to have a relation with someone or something

to be in a certain relationship

the state of being associated with something

With that relationship

to concern oneself with something

something of that sort

meretricious relationships

be relevant to

on a friendly footing

a close relationship

close in relationship

on a fair footing

with relevance

of things, to have relationship or connection

mutual relation―reciprocal relation―interrelation―reciprocity

to sever relations―break off relations―sever connections―cut the connection―（between the two）

to be concerned

a relationship

be in a relationship with

The relation is complicated.

related by an isometry

to establish a relation to anything―establish a connection with anything

each component in a mutual relationship

a state in which a relationship exists between two or more things

friendly relations―comradeship

a person who is involved and/or has a relation to something