発生(はっせい)outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state

事件(じけん)が発生(はっせい)した時(とき)は警察官(けいさつかん)の出番(でばん)です。

When an incident occurs, it's the police officer's turn to act. {outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state}

手(て)で腕(うで)をゴシゴシ擦(こす)っていたら熱(ねつ)が発生(はっせい)した。

Heat was generated when I rubbed my arm with my hand. {outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state}

受精卵(じゅせいらん)が他(た)細胞(さいぼう)の個体(こたい)へと育(そだ)つことを発生(はっせい)と言(い)います。

The process in which a fertilized egg grows into a multicellular organism is referred to as ontogeny. {outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state}

この物質(ぶっしつ)は燃(も)やすとダイオキシンを発生(はっせい)する有害(ゆうがい)物質(ぶっしつ)である。

This substance is a harmful material that generates dioxins when burned. {outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state}

農家(のうか)：「稲(いね)に害虫(がいちゅう)が発生(はっせい)したこととて、今年(ことし)は収穫(しゅうかく)量(りょう)が少(すく)ないのです。」

Farmer: "Due to the outbreak of pests in the rice, the harvest yield is low this year." {outbreak, spring forth, occurrence, incidence, generation (e.g. of power or heat), genesis, origin, ontogeny, development of complex multicellular structures from cell(s) in a simple state}