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2000 年-2010 年 2010 年-2025 年 2000 年一 ~2025 年 2010 年-2050 年 2025 年-2050 年
Right after cell phones were invented. Before the number of cell phone users reached a critical mass When cell phone users totaled to a certain number. When the number of cell phones decreased to a certain number.
a number a number of the number of the numbers of
2011-2016 2010-2025 2025-2040 1815-1830
There were more cell phone users during that period. The number of cell phone users reached about 100 million. More cell phones were used to call 911 when accidents occurred. Cell phones enabled people to have quick access to 911 services.
None Ⅰ only Ⅱ only Ⅰ and Ⅱ
The number of cell phones in use exploded in the late 1980s and part of the 1990s. The number of traffic deaths was reduced in the late 1980s and part of the 1990s due to cell phone use. Cell phone users are likely to be involved in traffic accidents. The use of cell phones has a life-saving effect for pedestrians and drivers.
Right after cell phones were invented. Before the number of cell phone users reached a critical mass When cell phone users totaled to a certain number. When the number of cell phones decreased to a certain number.
It had a life-taking effect because there weren’t enough cell phones in use then. The increased use of cell phones then caused a "life-taking effect." Traffic fatalities increased then because the number of cell phones in use decreased. Traffic fatalities decreased then because the number of cell phones in use increase
2000年-2010年 2010年-2025年 2000年一~2025年 2010年-2050年 2025年-2050年
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