Contrapropeller
整流（螺旋）推进器, 整流螺旋桨, 同轴反转式螺旋桨
🗣️ 情景例句
when the dog scratched on the front door.
当那狗在抓前门时。
A dog will not howl if you beat him with a bone.
骨头打狗狗不叫。
Then I added with a smile,
我微笑地接着说，