positive hole的用法和樣例：
例句
- The reason is that people born with the heart outside their ribcage do not have a hole in the chest cavity to fill up.
原因是，出生時(shí)心臟就在胸腔外的病人，其胸腔里沒(méi)有可容納心臟的空穴。 - The other way was to knock a bound electron off a neutral atom creating simultaneously an electron and a hole.
另一種方法是把束膊電子從中性原子中撞出，同時(shí)產(chǎn)生電子和空穴。
