to gain knowledge through practical experience
実践して学ぶ (jissen shite manabu)
"Students learn by doing during the science experiments."
"学生たちは科学実験中に実践して学びます。" (gakuseitachi wa kagaku jikkenchuu ni jissen shite manabimasu.)
to reduce the amount of something
to be extremely frightened
to continue progress on something
a general practical principle based on experience
building a business without external funding
to avoid mentioning unpleasant details