但是，熔剂保护法和气体保护法致使熔炼工艺及设备复杂化、易产生央杂，并且污染环境；

However, both flux and protective gas would lead to some problems such as inclusion, environmental pollution and complication of melting process and equipment.

youdao

但是，熔剂保护法和气体保护法致使熔炼工艺及设备复杂化、易产生央杂，并且污染环境；

However, both flux and protective gas would lead to some problems such as inclusion, environmental pollution and complication of melting process and equipment.

youdao