STARTING THE ROTOR …click anything to hear a little conversation · 🔬 try the experiment
HELICOPTER SCIENCE · 直升機科學
a rescue helicopter by the sea · click anything to hear a little conversation · 🔬 try the experiment
🔬 Let's find out! 一齊研究
Tap a step to start.
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click anything to hear a little conversation · 🔬 try the experiment · drag to look around · 📖 Words to find things