哭着把眼泪咽下笑着把眼泪吞下
[kū zhe bă yăn lèi yān xià xiào zhe bă yăn lèi tūn xià]
In the Chinese language, the sentence seems paradoxical: 'crying while swallowing down tears' means crying bitterly on the inside but hiding sadness; and 'smiling but swallowing tears' means putting up a happy front despite inner pain, implying an extremely strong endurance ability or a sad story the netname holder has experienced or witnessed.