backup

n.支持

backhanded, backhander, backing, backlash, backless, backlist, backlog, backpack, backpacker, backpacking, backrest, backscratcher, backset, backside, backslide, backsliding, backspace, backstage, backstroke, backtrack, backward, backward(s), backwardness, backwards, backwards (also backward), backwash, backwater, backwoods, backwoodsman, backyard, bacon, bacteria, bacterial, bactericidal, bacteriologist, bacteriology, bacterium, bad, bad debt, bad lands,