regulating speed with variable displacement的用法和样例：
例句
The organization and principle of the new type of rubber balloon with water volumometer are introduced. 介绍了新型水囊式容积测定仪的结构和原理。
Condensation chambers shall only be installed where necessary for steam and condensable vapor service when using instruments having relatively large volume displacement. 如果使用相对较大容积排水量的仪表，冷凝腔仅安装于蒸汽和冷凝蒸气工况。
