a chicken and egg situation
informal› a situation in which it is impossible to say which of two things existed first and which caused the other one
雞與蛋孰先難定的情況;因果難定的情形
(Translation of “a chicken and egg situation” from the Dictionnaire Cambridge anglais-chinois (traditionnel) © Cambridge University Press)
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soil
the material on the surface of the ground in which plants grow