Go "hand-in" to touch a shark, a crab, or thousands of tiny cleaner fish that will bite playfully at your fingers.

亲手触摸鲨鱼、螃蟹，或数以千计的小清洁鱼，它们会开玩笑地咬你的手指。

youdao

For example, when you touch the hot stove, not only does a message go out to move your hand but one also goes to another part of the brain to help you remember not to do that again.

比如当你碰到热火炉时，除了有信号传出让你挪开手外，还有信号会传向脑中另一区域让你记住这次教训。

youdao

For example, if you accidentally touch a hot stove, the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away.

比如你不小心碰到了热火炉，你皮肤中的神经就会向大脑发射疼痛信号，于是大脑就会发回信号让手挪开。

youdao