潜艇,也叫潜水艇,是能在水下航行的舰艇。潜艇是怎样实现下潜和上浮的呢?我们一起来做个简单的潜艇模型,一探究竟吧。材料准备空塑料瓶、约1米长的胶管、气球、注射器或者气筒、充气针(可用废旧签字笔芯替代)、螺母、螺杆、垫片、小刀、剪刀、锥子 Submarines, also called submarines, are ships that can sail underwater. Submarine is how to dive and float it? Let’s work together to be a simple model of the submarine, explore it. Material Preparation Empty plastic bottle, about 1 meter long hose, balloon, syringe or gas cylinder, inflatable needle (replace scrapped signature pen), nut, screw, washer, knife, scissors, awl