Here the update is used to blacken out all but the area code of the phone number .
下面的更新“掩盖”电话号码的所有部分，只留下地区编码。
One way to remove private information from paper documents is to blacken it out with a pen .
消除纸质文档上隐私信息的一个方法是用笔涂黑。
blacken out