He bought some sod to put in the bare spots of his lawn yard.
他买了些草皮种在他庭院草坪的空地上。
Silver brazing alloys will not flow over or bond to oxides. Oily or greasy surfaces repel fluxes, leaving bare spots which oxidize and result in voids and inclusions.
因为银钎焊合金并不会流过或粘接在氧化物上，而油污的表面及暴露的、容易氧化和导致空隙和杂物排斥焊剂。
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