This paper analyzed the characteristics of the pyroelectric detector based on its working principle. 摘要根據熱釋電探測器工作原理，對其使用特點(diǎn)進(jìn)行了分析。
Finally, the paper discusses the characteristics of the use of prepositions in the nominalized structures and its enlightenments to the teaching of preposition usage. 本文最后探討了介詞在名詞化中的使用特點(diǎn)及其對介詞教學(xué)的啟示。
