sky-diving

n [U] (person who takes part in the) sport of jumping from an aircraft and falling for as long as one safely can before opening one's parachute 延缓张伞跳伞运动（员）.

skirting-board (Brit) (US `baseboard), skit, skittish, skittishly, skittishness, skittle, skive, skiver, skivvy, Skokie, skua, skulduggery (also skullduggery), skulk, skull, skull and cross-bones, skull-cap, skunk, sky, sky-blue, sky-diver, sky-high, sky-rocket, sky-writing, skylark, skylight, skyline, skyrocket, skyscraper, skywards, slab, slack, slacken, slacker, slackly, slackness, slag, slag-heap, slain, slake, slalom,