作用指示

This article summarized the indicating function of bryop hyte to air pollution, heavy metal pollution and mineral resources.

综述了苔藓植物对大气污染、重金属污染和矿藏监测指示。

The direction of luminiferous evacuation indicator is fixed in complex fire accident scene，that is difficult to play safe and effective role in the evacuation instructions.

光型散指示牌指引方向固定不变，复杂火灾事故现场难于起到安全有散指示。