lǎo bàng shēng zhū
lit. an old oyster producing a pearl (idiom)
fig. birthing a son at an advanced age
老
lǎo
prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity
蚌
bàng
mussel
生
shēng
to be born
珠
zhū
bead
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