a device used to keep two things apart

Press a square spacer into the joint between the blocks. 将一个正方形垫片压入两块之间的连接处。

A toe spacer is a small cushion placed between the first and second toes that helps keep bones straight so that the bunion won't get worse. 脚趾垫是放置在大拇趾和第二个脚趾之间的一个小垫片，可以帮助骨骼保持平直，防止拇囊炎恶化。

a large empty tube that attaches to an inhaler (= a small device for breathing in medicines) and helps the medicine go straight to your lungs

Breathe in and out from the spacer for four breaths in a row. 连续四次对着储雾罐吸气并呼气。

For some, an asthma spacer can be used in conjunction with their prescribed inhaler. 对于一些人来说，哮喘储雾罐可以和医生开给他们的吸入器一起使用。