One thing to note is that, when specifying the external number using the E.164 format, you must encode the leading + as %2B.
需要注意的一点是,在使用 E.164 格式指定外部号码时,必须将前面的 + 编码为 %2B。
In a real implementation, each event would include some type of patient identifier that would be used to find the doctor's E-mail address from an external data source.
在一个真实的实现中,每个事件都将包含某种类型的病人标识符,用于从一个外部数据源查找医生的电子邮件地址。
The effect is similar to the use of external images to track E-mail.
由此带来的影响类似于使用外部映像跟踪电子邮件。
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