The use of cellular phones is not permitted on most aircraft.
大多数飞机上不许使用手机。
Now many people are using cellular phones.
现在许多人都在使用蜂窝移动电话。
More than 2 billion people worldwide use cellular phones.
全世界有超过2百万的人使用手机。
Because of its convenience, cellular phones are in high demand in the market.
由于它的方便，移动电话目前在市场上的需求量很大。
Because of its convenience, cellular phones are in high demand in the market.
由于它的方便，移动电话目前在市场上的需求量很大。
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