我在玩手機用英文怎么表達？

　　A group of kids were playing with a ball in the street.

　　一群孩子在街上玩球。

　　The children were playing in the sand.

　　孩子們正在玩沙子。

　　Germany is playing a leading role on the international stage.

　　德國在國際政治舞臺上起著主導作用。

　　The mobile phone business was actually his bread and butter.

　　移動電話業務實際上是他的主業。

　　In the budget before last a tax penalty on the mobile phone was introduced.

　　上上次的預算案中對移動電話引入了懲罰性稅收。