Japanese edit

For pronunciation and definitions of はっせい – see the following entries.
発生
[noun] occurrence, incidence
[noun] (biology) development
[verb] occur, rise
[verb] develop
発声
[noun] vocalization (act of vocalizing or something vocalized)
[noun] leading others in a cheer or song
[verb] to vocalize
[verb] to lead others in a cheer or song
(This term, はっせい, is the hiragana spelling of the above terms.)