芯的用法和样例：
例句
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每天早晨这位仆人修剪灯芯，添加灯油。
The servant trims the lamp every morning. -
石膏灰泥板，灰胶纸柏板由石膏灰泥作芯板结合几层纤维板或纸浆板制成的硬板，在建筑中用于代替灰泥或木板来建造墙壁
A rigid board made of layers of fiberboard or paper bonded to a gypsum plaster core, used instead of plaster or wood panels in construction to form walls. -
这些大木材，表面上看被烟熏得黑黑的，有些地方被虫蛀了，烂了，但内芯却是十分坚硬的。
The great timbers, darkened now by smoke, wormed in places, looking rotten on the surface, but hard in the core, hard as iron.
