彼らは私を笑顔で迎えてくれた。

they (usually male); them

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

I; me; private affairs; personal matter; secrecy; selfishness

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

smiling face; smile

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

to go out to meet; to receive; to welcome; to greet; to salute; to hail; to reach; to approach; to enter (a phase, era, etc.); to accept (e.g. as a member of a group or family); to call for; to summon; to invite; to approach (a certain time, a point in one's life, etc.)