单词	upstroke
释义	upstroke /ˈʌpstrəʊk / noun A stroke made upwards: the upstroke of the whale’s tail... The course package consists of training in how to shape letters, analysis of alphabets, upstrokes, horizontal strokes, curves, zigzag lines and exercises in rhythm drills, drawing of parallel lines and drawing of circles. The video shows a bird with white in a big rectangle all the way across the trailing edges of both upperwings - white that is visible on both the upstroke and the downstroke - long wings - powerful flight - like nothing I've ever seen. This limb action would be relatively inefficient compared with that of modern animals such as penguins, whose wings produce propulsive force throughout virtually the whole of the upstroke and downstroke.
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英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。