by accident one in a while, occasionally 
gelegentlich gelegentlich 
occasionale occasionalmente 
occasionnel occasionnellement 
ocasional ocasionalmente by accident 44 偶然 [-] ǒurán (by chance-suffix) by accident: ~事件 accidents || ~机 会 an accident opportunity || ~遇到 run into, come up against ' one in a while, occasionally 15 偶尔 [-爾] ǒu’ěr (occasionally-this) one in a while, occasionally: ~迟 到occasionally be late || ~聊聊天 chat occasionally || 她在节食, ~吃点水果. On her diet, she only occasionally eats fruit. '
Giường sofa chỉ thích hợp cho việc sử dụng không thường xuyên. 
The sofa bed is suitable for occasional use only.
Das Schlafsofa ist nur für gelegentliche Nutzung geeignet.
เตียงโซฟาเหมาะสำหรับใช้เป็นครั้งคราวเท่านั้น
沙发床只适合偶尔使用。