number
[名词]
a word, sign, or symbol that represents a specific quantity or amount

数字, 号码
Ex: The street address and number are essential for accurate mail delivery .
email
[名词]
a system that is used to send and receive messages or documents via a network

电子邮件, 邮箱
Ex: We email to communicate with our colleagues at work .
phone number
[名词]
the number used for calling someone's phone

电话号码, 手机号码
Ex: phone number for customer service is printed on the back of the product .

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