English: The bathtub corner splash guard helps fill the gap between the shower curtain and the wall and prevents water from splashing onto the floor.

You can use Silicone sealant if you want a more permanent fix, or use Blue Tack for a temporary fix. If your Bathtub and wall are not perfectly perpendicular, then you might need some filler.

中文：浴缸边角挡水板可以阻挡洗澡时水从浴帘和浴缸角落的空隙溅到地上。

如果需要很牢固地固定住，推荐使用硅胶。零时固定可以试试蓝丁胶。要是浴缸和墙壁不是垂直的话，可能需要准备点填空的材料。