Chinese phrase translation: 闷葫芦 (mèn húlu) an enigma

闷葫芦 (mèn húlu) an enigma; a puzzle

Usage:

葫芦的形状是肚子大口小，因为这个特点，所以想倒出装在里面的水很难。“闷葫芦”是指不太爱说话的人，就像葫芦一样，心事很难让人猜透。
The shape of calabash gourd is small mouth and big belly. It’s hard to pour out the water inside of it. “闷葫芦”means a person who does not speak a lot as a calabash gourd or an enigma that is difficult to understand.
Sentences:

1、Zhè háizi shì gè mèn húlu,shéi dōu bù zhīdao tā zài xiǎng shénme.
这孩子是个闷葫芦，谁都不知道他在想什么。
The kid is like an enigma and nobody knows what he is thinking.
2、Tā shì gè mèn húlu,yìtiān dào wǎn dōu bù kāi kǒu shuōhuà.
他是个闷葫芦，一天到晚都不开口说话。
He is like an enigma and speaks nothing all day long.