事先shì xiān
in advance, before the event从前cóng qián
previously, formerly, once upon a time从此cóng cǐ
from now on, since then, henceforth以来yǐ lái
since (a previous event)傍晚bàng wǎn
in the evening, when night falls公元gōng yuán
(year) AD, Christian era同时tóng shí
at the same time, simultaneously固定gù dìng
fixed, set, regular