Gmail displays the first 100 or so characters of an email, minus the subject length. If the first paragraph ends before this limit, it will only show this much.
iOS devices show about 80 characters, again with much the same rules.
There's no setting that you can send through to determine what gets displayed as the preview in an email.
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Gmail 显示电子邮件的前 100 个左右字符，减去主题长度。如果第一段在此限制之前结束，则只会显示这么多。
iOS 设备显示大约 80 个字符，同样具有大致相同的规则。
您无法通过发送设置来确定在电子邮件中显示为预览的内容。
Gmail displays the first 100 or so characters of an email, minus the subject length. If the first paragraph ends before this limit, it will only show this much.
iOS devices show about 80 characters, again with much the same rules.
There's no setting that you can send through to determine what gets displayed as the preview in an email.