第一

first; firstly; foremost; primarily; primary; initial; opening; premier; first and foremost; first of all; first up; for a start; in the first place; most importantly; in the first instance; top; number one

部分

part; piece; portion; section; segment; division; slice; aspect; zone; facet; partial; fractional; some; partially; partly; in part; semi-; demi-; sub-; pt; pt. (short for part)

缩写

abbreviate; shorten; abridge; abbreviation; acronym; initialism; contraction; abbr