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1·Many people inadvertently transpose digits of the ZIP code.

许多人粗心地把邮政编码的数字弄颠倒了。《柯林斯英汉双解大词典》

2·Using a Magic Marker, he wrote seven digits on the poster-size banner.

他用白板笔在海报大小的横幅上写了七个数字。《柯林斯英汉双解大词典》

3·By 2008, the figure had fallen into the single digits.

到2008年，这一数字已降至个位数。

4·What's the biggest number you can represent with three decimal digits?

你能用三个十进制数字表示的最大数字是多少？

5·The fourth to the seventh digits tell you which area the number is recorded in.

第4到7位数字告诉你数字被记录在哪个区域。

6·Canada's mobile phone numbers are perhaps the world's shortest: they use seven digits.

加拿大的手机号码可能是世界上最短的：使用7位数字。

7·What can we know from the fourth to the seventh digits of a mobile phone number in China?

在中国，我们能从手机号码的第四位数到第七位数知道些什么？

8·Canada's mobile phone numbers are perhaps the shortest in the world: they use seven digits.

加拿大的手机号码可能是世界上最短的：他们使用7位数字。

9·Eleven digits can be used to make tens of billions of mobile phone numbers, according to the Xinhua News Agency.

据新华社报道，11位数字可构成数百亿个手机号码。

10·Perhaps in the broader world, you might find years that have two or four digits and might even contain an apostrophe, as in '09.

可能在一个更广阔的世界，您可能发现拥有两位或四位数字的年份，甚至可能包含一个撇号，如'09。

(1)two digit二位的

(1)binary digit二进制数字，二进制位

(1)check digit[计]校验数位

(1)digit span数字广度

(1)decimal digit十进制数字（位）