他微笑时好阳光她微笑时好天真
[tā wēi xiào shí hăo yáng guāng tā wēi xiào shí hăo tiān zhēn]
Translating into English would mean 'His smile seems very sunny; her smile seems very innocent'. It compares and praises two people's different smiles: one exuding a warm and positive vibe while the other appears innocent and natural.