排出

1. Origins, structure, and basic meaning

• Structure: 排出 is a noun and irregular transitive verb read はいしゅつ, meaning to discharge heat, water, or another substance from inside to outside.
• Basic usage: Mark what is discharged with を and the outward direction with へ, as in 熱を外へ排出する; use 排出された水 for water already discharged.
  • この装置は内部の熱を外へ排出する。 says that the device releases its internal heat outside; 工場では排出された水を検査してから再利用する。 describes inspecting discharged water before reusing it at a factory.

2. Common pitfalls and similar expressions

• 熱を外へ排出する
  • を marks the heat being discharged, while へ marks its outward direction.
• 排出された水
  • The passive form before the noun describes the water as already having been discharged.
• 検査してから再利用する
  • てから establishes the sequence of inspecting the discharged water first and reusing it afterward.