When glass is used for both the stopcock body and the plug, the contacting surfaces between them are special ground glass surfaces (see Laboratory glassware) often with stopcock grease in between.

• 在他们的眼里，所有的生命都没有分别，就冲着这一点，我愿意在上帝和佛祖面前跪下我尊贵的双膝，因为从他们目光里，我不仅看见了无量的慈悲，无量的尊严，还有无量的宽容。