海底撈月

hǎidǐlāoyuè

try to fish out the moon from the bottom of the sea—strive for the impossible or illusory

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hai3 di3 lao1 yue4

to fetch the moon from the seabed (idiom); a hopeless illusion

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海底撈月|海底捞月 [hǎi dǐ lāo yuè] ► to fetch the moon from the seabed (idiom); a hopeless illusion