playground的近义词/同义词有：recreation, field, park, ground, sports, court。n.playground的近义词（操场,运动场）：recreation, field, park, ground, sports。playground的近义词（其他释义）：court。...
Lights reflected off dust-covered walls creating a ghostly luminescence.灯光照在满是灰尘的墙上，反射回苍白的冷光。With good light collection, about 30 % of the luminescence quanta may reach the photocathode.在良好的光收集条件下, 约30%的荧光量子可以到达光阴极.cryst...