special delivery
delivery of mail (a letter, parcel, etc) by a special messenger instead of by the usual postal service (信件、 包裹等的)专递
If you want the letter to arrive tomorrow send it (by) special delivery. 要让这封信明天到, 就得用专递服务.
This shows how long it was before we deemed it necessary to make sure that all our children could share in the knowledge accumulated by the'happy few' during the past centuries.