第一性徵

第一性征
dì-yīxìngzhēng
  1. (biology) primary sexual characteristics
  2. primary sexual characteristics

Wiktionary

Entry Composition

=1 第一 dìyī
  1. first
  2. most important; primary; foremost
=1 第一 dì-yī
  1. (literally, figuratively) first; 1st
  2. being the most important consideration; being essential, or a priority; coming first
  3. first; 1st
  4. firstly
  5. number one; #1; first (in a test, competition, etc.)
2 性徵 xìngzhēng sexual characteristic