industries for instance coalmining, ship-constructing and so on which contain using substantial or heavy equipment or which generate significant or heavy goods. swaar industrie صِناعَة ثَقيلَه тежка промишленост indústria pesada těžký průmysl die Schwerindustrie sværindustri βαριά βιομηχανία indus

The period of darkness beginning at the end of night astronomical twilight when the Solar is eighteen levels underneath the horizon, and ending at the beginning of morning astronomical twilight.Night or nighttime will be the time period among the sunset and the dawn in the event the Sunshine is below the horizon. This happens soon after dusk. The a