1. boil     | bɔɪl |

cụm từ hay gặp
- boiling point

Ex: Gold melts at 1064 degrees centigrade and boils at 2808 degrees centigrade

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2. burn    | bɜːn |

cụm từ hay gặp
- burn something down
- burn fuel/ coal/ wood
- burn brightly/ fiercely
- badly/ severely burned

Ex: Incineration plants should be built to burn household waste

3. cool    | kuːl |

từ trái nghĩa: warm, heat

Ex: Huge fans will have to cool the concrete floor to keep it below 150 degrees

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4. energy    | ˈenədʒi |

từ đồng nghĩa: power
cụm từ hay gặp
- renewable/ solar/ wind/ nuclear energy
- energy efficiency/ conservation
- an energy crisis
- conserve/ save/ store/ consume/ generate energy

Ex: The energy efficiency of public transport could be improved

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5. freeze     | friːz |

từ liên quan: melt, thaw, boil

Ex: The discovery of how to freeze water at higher temperatures

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