bāo​fu​dǐ​r

family valuables

包袱底儿 包袱底兒 bāo​fu​dǐ​r
family valuables
(colloquial) family valuables accumulated over a long time; resources or money kept in reserve that are not easily used
secrets
(colloquial) one's secrets or private matters that one wants to hide; privacy
best act
(colloquial) a performer's unique skill or best act in a performance; one's most impressive ability