I think the word 優先 needs to be expressed with the word "first" as in the examples in the below websites:

http://www.electronicsforu.com/electronicsforu/circuit/mohit...

Fastest-finger First
If two events appear to occur almost simultaneously, it becomes quite difficult to decide which one occurred first. The circuits that can decide who pressed the buzzer first in a quiz are usually designed by adopting principles of digital electronics involving flip-flops. Here is a novel circuit idea to do the same job reliably by using operational amplifiers—the building blocks of analogue electronics.
US$ 1
Rs 50 Circuit Idea

441 Fastest-Finger-First
Here is a fastest-finger-first circuit that can be used for quiz games played between two contestants. Each player is provided with a switch.
US$ 1
Rs 50 Circuit Idea

442 Fastest-Finger-First Using Microcontroller
Useful for quiz games, dumb charades, etc, this fastest-finger-first circuit displays the player number along with a beep sound when a specific player presses the button before others. It is designed for seven players and can be constructed easily using minimal hardware and software

http://www.simplecircuitdiagram.com/2010/06/25/fastest-quiz-...
This is a quiz bell/alarm circuit. This circuit indicate “fastest finger first”. This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. ...

http://www.desmith.net/NMdS/Electronics/Jeopardy.html
Jeopardy (Fastest Finger First)
This project describes a "Fastest Finger First" system that is cheap to build, has high noise immunity, is reliable and is also extensible.

http://www.electronicsandyou.com/circuit/electronics_circuit...
Multi-User Jeopardy Game (Fastest Finger First)