小三她是个好东西
[xiăo sān tā shì gè hăo dōng xī]
This carries derogatory connotation about third parties介入别人的感情或家庭关系的人被视为社会负面形象，即所谓的“小三”. 此用名表达对不忠行为复杂的情感认知。In English-speaking countries, this phrase expresses complex feelings and social views on infidelity and 'the other woman/man'.