Sentence:  They 'd peddled the soap virtually alone , and without much success , until about a year ago , when - with the addition of `` SX-21 '' to their secret formula and the inauguration of a <WSD>high-powered</WSD> advertising campaign - sales had soared practically into orbit . 
Meaning of the word marked with <WSD> tags:  (used of microscopes) capable of a high degree of magnification