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backstroke n [U] swimming stroke done on one's back in the water 仰泳. background, backhand, backhanded, backhander, backing, backlash, backless, backlist, backlog, backpack, backpacker, backpacking, backrest, backscratcher, backset, backside, backslide, backsliding, backspace, backstage, backtrack, backup, backward, backward(s), backwardness, backwards, backwards (also backward), backwash, backwater, backwoods, backwoodsman, backyard, bacon, bacteria, bacterial, bactericidal, bacteriologist, bacteriology, bacterium, bad, [[修改/添加解释]] |
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