| 内 |
nèi dǎn | inner container (e.g. the rice pot inside a rice cooker, the vacuum bottle inside a thermos, the tank inside a hot water heater, the bladder of a football) |
| 内 |
nèi | inside / inner / internal / within / interior |
| 胆 |
dǎn | gall bladder / courage / guts / gall / inner container (e.g. bladder of a football, inner container of a thermos) |