Gredag
石墨油膏, 石墨油脂, 膠體石墨
??? 情景例句
I've got no idea.
我不知道。
It is dogged (that) does it.
天下無難事，只怕有心人。
But even when such refinements are not available, there is plenty to keep you occupied.
即使沒有這些消遣條件，也總是有事可做。