1. What is an ordinary order

An ordinary trade is a limit order placed in a standard US stock order at a specified price and will only be executed if a specified price or better is reached.  

If the limit price is not reached or exceeded, no order will be executed and any outstanding limit order will be cancelled automatically after the market closes.

Partially traded limit orders can be cancelled or changed, but only for the untraded part.

The original order is still effective in the process of changing or canceling the order, and it may occur that all the orders in the process of changing or canceling the original order cannot be cancelled or changed.