...If I am not proficient enough, yet knowing the rudiments I can easily improve... 
Rafael Sabatini 「Scaramouche」
...He was likewise a proficient in the Bambarratongue, and promised on that account to be of great utility to mein future...
Mungo Park 「Travels in the Interior of Africa, Vol. 1 [of 2]」
...They are very proficient inthrowing stones and other missiles...
Royal Dixon 「The Human Side of Animals」
...Under thestimulus of these higher standards the Negro medical profession will becomemore thoroughly equipped and proficient in the years to come...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
...Though never proficient in the grammar of art he managedby blendings of color to suggest certain sentiments regarding lightand air that have been rightly esteemed poetic...
John C. Van Dyke 「A Text-Book of the History of Painting」
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