to try to do something that is impossible or illusory; to waste one's efforts on something that cannot be achieved

(idiom) lit. to fish for a needle at the bottom of the sea; used to describe something that is extremely difficult to find or impossible to achieve

the process in geology where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge; it is a key mechanism for continental drift and plate tectonics

the geological theory that oceanic crust forms along submarine mountain ridges and then spreads out laterally

Haidilao; a popular Chinese hot pot restaurant chain originally founded in Sichuan province in 1994

to strive for the impossible or to make a futile effort; also refers to an upward scooping motion in martial arts or winning on the last tile in mahjong

the coco de mer palm or its fruit, native to the Seychelles and often used in Chinese soups and desserts

a hydrothermal vent on the ocean floor, typically in areas of volcanic activity

a telegraph sent via an undersea cable; cablegram

Submarine cable laid on the seabed for telecommunications or electrical transmission.

Cables laid on the seabed used for transmitting telecommunications signals like telegraphs and telephone calls

an acupuncture point located at the perineum, situated between the anus and the genitals

a woman's mind is difficult to fathom or unpredictable

muladhara or the root chakra, the first primary chakra located at the base of the spine

seaquake; an underwater earthquake occurring at the bottom of the ocean that often causes significant changes to the seafloor structure

A mountain rising from the ocean floor that does not reach the water's surface; if it has a flat top, it is called a [[海桌山|海桌山|hai3 zhuo1 shan1]].