E-mail is a marvellously economical tool for keeping in touch with far-flung commercial contacts; you can send them a note at your leisure, 24 hours a day.

• 就与相隔遥远的商界熟人保持联系而言，电子邮件可谓一种极其经济的工具；一天24小时里，你可在任何方便的时候给他们发邮件。