expression
A French-derived expression (çà et là) used in Japanese to mean 'scattered about' or 'in various places'. It is a set phrase, not a productive grammatical pattern.
from French çà et là
公園にはサエラにベンチが置いてある。
Benches are placed here and there in the park.
彼の部屋には本がサエラに積まれていた。
Books were piled up here and there in his room.