be skilled in 熟练掌握某种技术
An army commander must be skilled in tactics.
一名军事指挥官必须精通战术。
have superiority in sth 在某些方面有优势
It was believed that the country already had superiority in conventional armies and weapons.
据信，这个国家已在常规军队和常规武器方面占有优势。
have an edge on/over sth 在哪方面更有优势，比某人更有优势
We can't beat them at tennis, but we have an edge on them in pingpong.
打网球我们赢不了他们，可是论乒乓球，我们比他们强。
be specialized in sth 在某方面非常专业
I'm specialized in brewing beer
我对酿造啤酒很有研究
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