be skilled in 熟練掌握某種技術
An army commander must be skilled in tactics.
一名軍事指揮官必須精通戰術。
have superiority in sth 在某些方面有優勢
It was believed that the country already had superiority in conventional armies and weapons.
據信，這個國家已在常規軍隊和常規武器方面佔有優勢。
have an edge on/over sth 在哪方面更有優勢，比某人更有優勢
We can't beat them at tennis, but we have an edge on them in pingpong.
打網球我們贏不了他們，可是論乒乓球，我們比他們強。
be specialized in sth 在某方面非常專業
I'm specialized in brewing beer
我對釀造啤酒很有研究
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