弟弟经常生病,有时吃药不行还要打针,这可是让他最害怕的事了。打针之所以让很多人感到恐惧,主要是因为长长尖尖的针头扎入皮肤时会有点刺痛,为此,我想发明一种无痛针管。这种针管从外表看,只是 The younger brother is often sick, sometimes not even taking medicine, which is what made him the most afraid. The reason why injections cause many people to feel scared, mainly because the long, pointed needles pierce the skin a little bit tingling, for which I want to invent a painless needle tube. This needle tube looks from the outside, just