Macker type arc heater

例句：

1. 1. TheMacker-type arc heater is an essential tool for welding.
   马凯型弧热器是焊接过程中必不可少的工具。
2. 2. The Macker-type arc heater was used to heat up the metal before it could be cut.
   使用马凯型弧热器加热金属，使其能够被切割。
3. 3. The Macker-type arc heater was used to heat up the metal before it could be cut.
   使用马凯型弧热器加热金属，使其能够被切割。