ruǎn mù sāi

cork (from the bottle)

The Chinese word '软木塞' refers to the stopper typically used to seal wine bottles and other containers. It is made from the bark of the cork oak tree, which is lightweight and has an excellent ability to prevent liquid from leaking out. In Chinese-speaking contexts, '软木塞' can also refer to the cork material used for insulation, crafting, or as a general term for any cork-like object.