graphite

石墨棒被用作核反应堆中的减速剂。

Rods made of ___graphite are used as moderators in nuclear reactors.

这种润滑剂含有石墨，可以有效减少机械摩擦。

This lubricant contains ___graphite to effectively reduce mechanical friction.

这种铅笔的笔芯含有石墨，因为它具有良好的导电性。

The core of this pencil contains ___graphite due to its excellent conductivity.