It is made mostly of reinforced plastic and has very few moving parts.
它主要是由强化塑料制成而且可移动零件很少。
英语百科
Reinforced plastic
Reinforced plastics are a recent class of composite materials in which the low modulus and temperature limitations of plastic is overcome by reinforcing it with fibres of high modulus.
Reinforced plastics find extensive use in many fields, such as automobiles and corrosion-resistant equipment like fibre-reinforced plastic (FRP) tanks, vessels, etc.