hints:

序號(hào)不用寫(xiě)~

標(biāo)點(diǎn)符號(hào)不用寫(xiě)~
is a fact of life hinge on
is a fact of life 是無(wú)可爭(zhēng)辯的事實(shí) hinge on依 ... 而定, 以 ... 為轉(zhuǎn)移 ——譯文來(lái)自: lina199