2021年6月25日
English in the News--Fly on the Wall 隱密觀察
One who is able to observe something closely but invisibly and without interfering in the situation. 躲在毫不引人注意的地方觀察，好似牆上的蒼蠅。
2021年6月25日
One who is able to observe something closely but invisibly and without interfering in the situation. 躲在毫不引人注意的地方觀察，好似牆上的蒼蠅。