those (referring to things distant from the speaker)

each person

to turn on, to switch on

zero on a test etc., no points earned / freezing point / zero (value of a function’s independent variables when the value of the function is zero)

Alternative form of 一々

first, foremost, number one

one person

one person / singleness, singularity / one's own efforts or strengths / an unmarried person, single

(rare) the first day of the month

once; one time