sk sky 天空 [Card #16; 字卡第16張: 第2個單字, 字母組合發音 sk]

Some more examples（更多例字）：
Initial position（首）：sky, ski, skip, skid, skit, skin, skim, skimp, skill, skillet, skinny, sketch, skeleton, skeptical, skein, skate, skirt, skunk, skulk, skull, skew

Final position（尾）：ask, bask, cask, task, mask, flask, desk, disk, brisk, frisk, risk, asterisk, whisk, dusk, husk, musk, tusk, kiosk