Answer
TWO SPEEDS
兩段速度
WINDOW QUESTION · ANSWERBUILD CLUB
The question
HOW MANY GEAR SPEEDS DOES EDDIE AND JOEY’S MIXING MACHINE USE?
Eddie 和 Joey 的攪拌機使用幾段變速齒輪？
Why it works
THE TWO-SPEED GEARING LETS THE STUDENTS COMPARE DIFFERENT MIXING MOTIONS
兩段變速讓學生能比較不同齒輪設定下的攪拌動作
See it in action · STUDENT INVENTION: MIXING MACHINE
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