This shows that the enamel liner was born in a wall mounted solar hot water is a long process.
由此看出,搪瓷内胆在壁挂式太阳能热水器领域里的诞生是一个漫长的过程的。
2
A small gap that can form between the casing or liner and the surrounding cement sheath, most commonly formed by variations in temperature or pressure during or after the cementing process.