ar star 星 [Card #19; 字卡第19張: 第1個單字, 字母組合發音 ar]

R-controlled vowel；當母音後面跟著r，r會影響母音的發音（r會和母音成為一個音節，發不是長母音也不是短母音的特別音）。

Some more examples（更多ar例字）： are, bar, car, far, mar, par, tar, jar, ajar, char, charcoal, star, starry, scar, scarf, artifact, art, cart, dart, fart, tart, mart, smart, start, chart, part, party, apart, impart, depart, department, garment, hard, lard, yard, guard, chard, card, postcard, discard, bombard, retard, arm, farm, charm, harm, alarm, barn, yarn, darn, arc, ark, park, dark, lark, hark, bark, embark, mark, bookmark, trademark, landmark, stark, spark, sparkle, sparse, shard, shark, sharp, harp, large, charge, barge, arch, march, starch, marsh, harsh, farce, guitar, cigar, jaguar, caviar, bazaar, bizarre, avatar, radar, seminar, webinar, registrar, leotard, tarp, tartan, tartar*, target, tardy, tarnish, varnish, Arctic, artichoke, architecture, archive, army, artery, ardent, arduous, argue, arcane, archaic, arbitrary, arbitrate, articulate, article, arsenal, artificial, partial, parcel, particle, partner, parlor, parlay, parka, pardon, parse, parsley, parsnip, parlance, partition, partake, starve, startle, snarl, karma, carve, cargo, carton, carbon, carbonate, cartridge, cartilage, carpet, carcass, cartoon, carnation, carpenter, garner, garland, garlic, garb, garbage, garden, gardenia, garble, marble, marvel, marvelous, marshal, margin, darling, bargain, barb, barbecue, barley, barter, harbor, harvest, harness, harken, harmony, pharmacy, jargon, larder, farther, regard, gnarl, sarcasm, sarcastic, sardonic, embargo

* tartar 第一個音節（重音節）的 ar 和第二個音節（非重音節）的 ar 發不同音；第一個音節（重音節）的 ar 發 ar 的音，第二個音節（非重音節）發/ɚ/的音。

* unstressed syllable (非重音節)： calendar, grammar, altar, cellar, regular, similar, singular, vinegar, pillar, collar, dollar, scholar, popular, molar, polar, solar, sugar, familiar, peculiar, particular, spectacular, extracurricular, perpendicular, jeopardize, mustard 的 ar 非重音節，要發/ɚ/的音。