check before the loading

例句：

1. 1.Before leaving the office, I always makesure to check my emails.
   离开办公室前，我总是确保检查我的电子邮件。
2. 2. The policechecked the crime scene thoroughly before releasing thesuspect.
   警方在释放嫌疑人之前彻底检查了犯罪现场。
3. 3. She checked her phone forany missed calls before heading out.
   她出门前检查了她的手机，看是否有未接来电。