metal level的用法和樣例：
例句
- Leaks above the glass level are usually not serious.
玻璃液面以上的滲漏一般并不嚴重。 - In order to implement the uniform step process of electroslag casting, it is necessary to ascertain the start time of extrusion or the surface of melted metal.
為了實(shí)現電渣熔鑄曲軸一步整體成型，必須確定擠拐的開(kāi)始時(shí)間，即金屬液面的位置。
