- ZeptosecondsZeptoseconds = 仄普托秒 / 仄秒 / (Taiwan Guoyu: 介秒介秒)
仄(仄普托)= zepto-
- YoctosecondsYoctoseconds = 幺科托秒 / 幺秒 / (Taiwan Guoyu: 攸秒攸秒)
幺(幺科托) = yocto-
The shortened forms, i.e.: 仄秒 & 幺秒 are probably more accessible than their long forms.
You can check out this Metric SI Prefixes Table in Chinese for even more details. Heres a quick and dirty current screen grab for reference: