closed system的用法和樣例：
例句
- People were not necessary for a closed ecosystem to run once stable, but they might be helpful in stabilizing it.
封閉系統一旦進(jìn)入穩定運行，人類(lèi)就不是必不可少的部分，不過(guò)，他們可能會(huì )有助于其穩定。 - Dowling points out that excess ink is recirculated within the sealed system, reducing consumption and contamination from lint, dust or dampener fluid.
道林指出，過(guò)剩的墨水循環(huán)的封閉系統，減少消耗和污染皮棉，塵?；蚓趩室?。
