A good electrical connection to the material to be welded must be established.
一个良好的电气连接并焊接材料必须建立。
To set up an honest human relationship, correct conception must be established.
建立诚信的和谐人际关系，必须树立正确的理念。
A borrow registry system must be established in case of borrow of the guidebooks.
有人借阅说明书时应该建立借阅登记制度。
The nature of gas enterprises determines that a perfect safety management system must be established.
燃气企业的性质决定其必须建立完善的安全管理体系。
The nature of gas enterprises determines that a perfect safety management system must be established.
燃气企业的性质决定其必须建立完善的安全管理体系。
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