鸟儿们紧贴在墙上，啄着砖缝。

The birds cling to the wall and nibble at the brickwork.

youdao

(勾墙等砖缝用的)水泥、灰泥等填充物。

To fill and finish the joints of (masonry) with cement or mortar.

youdao

铺装48小时后进行填缝，用水泥与石粉以1：0 . 5的比例确实填满砖缝，并确实地把砖面用清水清洗干净。

Joint filling 48 hours after macadamize, use the mixture of cement and crushed sand with 1:0.5 to fill, after that, use the water to clean roughly the tile surface.

youdao