expansion chamber（膨胀腔）是什么意思？音标发音+图解场景

膨胀腔 /ɛkspˈanʃən ˈtʃeɪmbə/ n

English: expansion chamber · 膨胀腔

释义：Space that is taken up by the gas in the capillary bore; it is pushed back as the mercury rises into it.

这个词出现在以下图解场景（1）