That slipping sheet structure also makes graphite an excellent lubricant.

这种滑动片状结构也使石墨成为一种极好的润滑剂。

Madame Olenska slipped the sheet into the envelope, wrote a name on it, and put it into her pocket.

奥兰斯卡夫人把那张纸塞进信封， 写上一个名字，然后放进自己的口袋。