越往熔岩内部气孔越小，变形越不明显。
The closer to the inner parts of lava flows, the smaller vesicles and the less obvious deformation.
焊接造成的内部气孔使环形锯丝在该处产生疲劳断裂。
The holes in welding area mainly cause the fatigued wire to break.
碱盐对镁铝尖晶石砖的侵蚀主要表现为以气相或液相形式渗透到耐火材料内部气孔中并在冷端沉积，使砖体致密化。
The infiltration and deposition of alkali salts in the form of vapor or liquid will gradually result in a complete filling of the apparent pore and brick densification.
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