permanent magnet
permanent magnet — 名詞
1. a piece of metal or another material that produces its own magnetic field and st
永久磁鐵
不需外部電力即保有磁力的磁鐵
a piece of metal or another material that produces its own magnetic field and stays magnetic for a long time without needing electricity or an outside force to keep its power
The speakers in Sumin’s car contain powerful permanent magnets that produce clear sound.
Sumin 車上的喇叭含有強力永久磁鐵，能產生清晰的聲音。
attributive use: powerful permanent magnets
Hari attached a small permanent magnet to the fridge door to hold up his daughter’s drawing.
Hari 在冰箱門上貼了一塊小永久磁鐵，用來固定女兒的畫作。
common household use: attached to fridge door
Ravindra saw the scrapyard crane drop a car when power failed, but a permanent magnet stuck to a beam.
Ravindra 看到回收場的起重機在停電時丟下一輛汽車，但一塊永久磁鐵仍吸附在鋼樑上。
Marta found the steel screws under the sofa by running a permanent magnet over the carpet.
Marta 用永久磁鐵在地毯上掃過，找到了掉在沙發底下的鋼螺絲。
The recycling plant uses a giant permanent magnet to lift scrap metal onto a conveyor belt.
回收廠用一個巨大的永久磁鐵將廢金屬吸起，放到輸送帶上。
- hard magnet
technical synonym used in materials science; less common in everyday English
- electromagnet
a magnet that requires electricity to produce a magnetic field
文法句型
permanent magnet + noun (e.g. permanent magnet motor)
adjective + permanent magnet
用法筆記
Countable noun. Often used before another noun as a modifier, as in 'permanent magnet motor' or 'permanent magnet generator'. The opposite concept is an electromagnet, which needs electricity to create a magnetic field.
常見錯誤
❗ 'The magnet is permanent' (when describing a magnet that works). ✅ 'This is a permanent magnet.' — ‘permanent’ describes the type of magnet, not a temporary condition.