back-rest chair

基本解释

The shape of the holes that penetrate the chair back-rest has better be an ellipse.
所述穿透椅背的孔的形狀最好是橢圓形。
ip.com
The chair seat is provided with a water-leaking hole penetrating the chair back-rest.
所述椅座上設有穿透椅座的漏水洞。
ip.com
The utility model discloses a bus seat-chair, which comprises a chair seat and a chair back-rest that are connected as a whole. The chair seat and the chair back-rest are provided with cavities.
本實用新型公開了一種公交客車座椅，它包括連爲一躰的椅座和椅背，所述椅座和椅背內設有空腔。
ip.com