0 a way of sending letters or packages by using a service that deals with them in a special way and makes sure they do not get lost: --
You'd better send the check (by) registered mail.
1 a way to send a letter in which you pay extra to have a record of when it was delivered and who received it --
2 a way of sending letters or packages by mail using a special service, so that they will be dealt with in a special way and you will receive money if they arrive late, are lost, or damaged: --
Please send the parcel by registered mail.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.