in，use什麼詞性

詞性是介詞短語，例如：

1、The chapel was built in the 12th century and is still in use today.這座小教堂建於12世紀，今天仍在使用。

2、Analysis of Limitations of Domestic Gas Drainage Monitoring System in Use.國內瓦斯抽放監控系統在使用中的侷限性分析

3、This effect cannot be applied because it is already in use.不能再應用此效果，它已在使用中。