Explains the physical phenomenon where hot metal contracts as it cools.
说明热金属在冷却时会发生收缩的物理现象。
| Expression | 热的金属一冷（下来）就收缩. |
|---|---|
| Meaning | The hot metal contracts as it cools (down). |
| Reading | rè de jīnshǔ yī lěng xiàlai jiù shōusuō |
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