Bhashya
तद्यथा लवणेन सुवर्णं संदध्यात् ।क्षारेण टङ्कणादिनाखरे मृदुत्वकरं हि तत् ।सुवर्णेन रजतमशक्यसंधानं संद-ध्यात् ।रजतेन तथा त्रपु, त्रपुणा सीसम्, सीसेन लोहम्, लो-हेन दारु, दारु चर्मणा चर्मबन्धनेन ।एवमेषां लोकानामासांदेवतानामस्यास्त्रय्या विद्याया वीर्येण रसाख्येणौजसा यज्ञस्यविरिष्टं संदधाति ।भेषजकृतो ह वा एष यज्ञः-- रोगार्तइव पुमांश्चिकित्सकेन सुशिक्षितेन एष यज्ञो भवति ।कोऽसौ ?यत्र यस्मिन्यज्ञे एवंवित् यथोक्तव्याहृतिहोमप्रायश्चित्तवित्ब्रह्मा ऋत्विग्भवति स यज्ञ इत्यर्थः ॥
In plain words
Just as one solders gold with salt or borax on a hard surface, since it softens the metal; just as one joins silver with gold, tin with tin, lead with lead, iron with iron, wood with wood, or wood with leather bindings—in this very way, through the potency and vigor known as the essence of these worlds, deities, and the threefold Veda, he repairs the damaged portions of the sacrifice. Indeed, this sacrifice becomes like a sick person tended by a skilled physician. Which sacrifice is this? That in which the supervising priest knows this truth and understands the proper oblation and expiation through the mystical utterances. That is the intended meaning.
Close to the Sanskrit
Just as one might solder gold with salt, or with alkali such as borax on a hard surface, for it is a softener; and one might solder silver, which is difficult to join, with gold; and similarly tin with tin, lead with lead, iron with iron, wood with wood, and wood with hide and hide-binding. In the exact same way, by means of the potency and vigor known as the essence of these worlds, these deities, and this threefold Veda, he heals the broken part of the sacrifice. Verily, this sacrifice becomes like a person afflicted with illness treated by a well-trained physician. Which one? That sacrifice in which a Brahmā priest who knows thus—who knows the prescribed oblation and expiation through the vyāhṛtis—serves as the priest; this is the intended meaning.