back-scratcher
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和背挠类似，弯曲双膝，这样你的雪板就在你的后面。
Similar to a Backscratcher, bend your knees so the Skis will be behind you.
youdao
给我挠挠背–我痒痒。
Scratch my back – I've got an itch.
《柯林斯英汉双解大词典》
大象有时会用树枝挠背。
An elephant will sometimes use a stick to scratch its back.
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