This contract is made of one original and two duplicate originals, all of which are of the same effect.

本合同一式三份，具有同等效力。（本合同有一份正本和两份副本，正本和副本都具有相同的效力。）

Is this a duplicate or the original?

这是副本还是正本？

A skilled locksmith can duplicate many types of keys just by looking at the original.

一名老练的锁匠只要看一眼原物就可以复制出许多类型的钥匙。

Or you can duplicate and edit existing application code while leaving the original mixed UI and business logic in place.

或者，可以复制和编辑现有的应用程序代码，同时保留最初的UI和业务混合的情况。

Duplicate chromosomes were sent back to the center of the original cell, an event once thought impossible.

已经被复制的染色体则又被重新送回到了原细胞的细胞核中，这样做以前一向被认为是不可能的。