不透水 | bù tòu shuǐ | waterproof / watertight / impermeable | |
滴水不漏 | dī shuǐ bù lòu | lit. not one drop of water can leak out / watertight / rigorous (argument) | |
点水不漏 | diǎn shuǐ bù lòu | not one drop of water leaks (idiom) / fig. thoughtful and completely rigorous / watertight |