Visuddhimagga VIII-166

Manussesu pana keci hatthiahiādayo viya kāladdhānavasena dīghaṃ assasanti ca passasanti ca.

在人类之中，有的出息与入息，依照时间长如象与蛇等，

Ñ(VIII,166): And in the case of human beings some breathe in and breathe out long, by extent of time, as elephants, snakes, etc., do,

Keci sunakhasasādayo viya rassaṃ,

有的则短如犬兔等，

Ñ: while others breathe in and breathe out short in that way as dogs, hares, etc., do.

tasmā tesaṃ kālavasena dīghamaddhānaṃ nikkhamantā ca pavisantā ca te ‘‘dīghā’’ ittaramaddhānaṃ nikkhamantā ca pavisantā ca ‘‘rassā’’ti veditabbā.

所以对于他们（的出入息）是依时间的，长时间的出与入为长（出入息），短时间的出与入为短（出入息）。

Ñ: Of these, therefore, the breaths that travel over a long extent in entering in and going out are to be understood as long in time; and the breaths that travel over a little extent in entering in and going out, as short in time.