有效期内

within the period of validity / before the sell-by date

to have; there is / (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)

effective / in effect / valid

variant of 傚|效[xiao4]

variant of 效[xiao4] / to imitate

variant of 效[xiao4]

effect / efficacy / to imitate

to imitate (variant of 效[xiao4])

period of validity / sell-by date

variant of 期[qi1] / period / cycle

a period of time / phase / stage / classifier for issues of a periodical, courses of study / time / term / period / to hope / Taiwan pr. [qi2]

inside / inner / internal / within / interior