thrust tube（按压管）是什么意思？音标发音+图解场景

按压管 /ˈθɹʌst ˈtjuːb/ n

English: thrust tube · 按压管

释义：Part that is activated by the push-button; it pushes out or retracts the writing tip when pressure is applied.

这个词出现在以下图解场景（1）