- 形状记忆合金 xíngzhuàngjìyìhéjīn shape-memory alloyA type of smart material that can be deformed at one temperature and then return to its original shape when heated to a specific temperature; commonly used in copper-aluminum-nickel and nickel-titanium systems.
- 没有形状 méiyǒuxíngzhuàng shapelesshaving no physical form or definite shape