[以卵击石 / 以卵擊石, yǐ luǎn jī shí, ㄧˇ ㄌㄨㄢˇ ㄐㄧ ㄕˊ]lit. to strike a stone with egg (成语 saw); to attempt the impossible; to invite disaster by overreaching oneself#86738[Add to Longdo]
[卵黄囊 / 卵黃囊, luǎn huáng náng, ㄌㄨㄢˇ ㄏㄨㄤˊ ㄋㄤˊ]yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)#88546[Add to Longdo]
[危如累卵, wēi rú lěi luǎn, ㄨㄟ ㄖㄨˊ ㄌㄟˇ ㄌㄨㄢˇ]precarious as pile of eggs (成语 saw); ready to fall and break at any moment; in a dangerous state#129061[Add to Longdo]