adj (1) 平直(滑，坦)的(level，even)：a～roof/land平顶/平坦的土地;(countryside/floor/lower meadow) be quite/absolutely～(野外/地板/低草地)十分/非常平坦;a large～surface to write on/for writing on 一个可供书写的大平面;～racing 平地赛马;～spin 近乎水平盘旋下滑;～-iron 熨斗;〖同〗level，even，smooth，plane，regular;〖反〗rough，uneven，irregular;
 (2) 平坦的，展开的(spread out;lying horizontally and at full length) [无comp]：lie～on one's back 伸开四肢仰卧;a～geometric figure 展开的几何图形;The earth was once thought to be～. 人们曾认为地球是扁平的。They took their naps，lying～on the floor. 他们平躺在地板上，小睡一会儿。〖同〗level;
 (3) 扁(浅)的(not deep or high) [无comp]：a～box/cap/peach 一个扁盒子/一顶扁平帽/一个蟠桃;a huge man with a broad～nose 一个鼻子宽而扁的高大男人;～dishes/pans/cakes 浅碟/浅锅/薄饼;
 (4) (乐)降低半音的((of a tone) lowered a half step in pitch;lower in pitch than is correct) [作pred]：D～降D调;The last note/Your piano/His violin/She is～. 最后一个音符/你的钢琴/他的小提琴/她低了半音。
 (5) 直截了当的，断然的(without qualification;absolute or positive) [无comp][作attrib]：give a～“no” to sb's request 对某人的请求断然地说“不”;give sb a～rejection/refusal 断然回绝/拒绝某人;〖同〗absolute，complete，total，positive，direct;
 (6) 轮胎跑气((of a tyre) with little or no air in it) [作pred]：have a～tyre 轮胎没气了;My tyre has gone～. 我的车胎没气了。
 (7) 走气(味)的(having lost its flavor，sharpness，as wine or food) ：The Coca-Cola/beer/soda is～. 这可口可乐/啤酒/汽水走气了。a～drink/food/lemonade 淡而无味的饮料/食物/柠檬水;The ginger ale went～after being left open. 那瓶姜汁酒由于开着盖，走气了。〖同〗tasteless;
 (8) (电池)电量不足的，没电的((of a battery) having lost some or all of its electrical power)：The battery has gone～. 电池没电了。
 (9) 乏味的，单调的(dull;lifeless;showing no emotion in one's voices) [作pred]：spend a very～weekend 度过一个非常单调乏味的周末;a～performance/party 单调的演出/晚会;speak in a～voice 用平淡乏味的嗓音讲话;(as)～as a pancake 平淡无奇的;
 (10) 生意平淡的(not having much business)：a～market 生意平淡的市场;
 (11) 1) 缺乏层次感，色调平淡(without shading) [作pred]：～colours/paintings 色调平淡的颜色/缺乏层次感的油画;2) 没有光泽的((of paint) not glossy)：a～paint 没有光泽的颜料;
 (12) 固定的(without modification or variation)：a～price/rate/fare 统一的价格/费用/收费;
 (13) 正好的(exactly)(infml)：Dinner will be ready in two minutes～. 晚饭再过两分钟整就准备好了。run the race in 50 seconds～用50秒整跑完赛跑的全程;〖同〗exactly;
 (14) 扁平足的((of feet) not having normal arches) [无comp]：
 and that's flat 就这么定了：I'm not going and that's～. 我不去了，就这么定了。
 fall flat 完全失败;The picnic fell～because of the rain. 由于下雨，野餐告吹了。
 → ′flatly adv 平淡地;断然地;′flatness n 平淡;͵flat-′bottomed adj (指船)平底的;′flatcar n 平板车;′flat-fish n 比目鱼;͵flat-′footed adj 扁平足的;
 adv (1) 低调地(below the true pitch)：sing～唱歌低半度;play the violin/piano～拉小提琴/弹钢琴低半度;
 (2) 断然地，完全地(positively;absolutely;completely)：He was told～that he couldn't leave early. 他被直截了当地告知不能早走。go～against sb's orders/one's promise 公然违抗某人的命令/违背自己的诺言;The man gambled and was soon～broke. 这个人赌博，很快就完全破产了。
 flat out 竭尽全力地：I ran～out but I still missed the bus. 我拼命往前跑，但还是没赶上汽车。
  n (2) 平面部分(flat surface，side or part of anything) [C，the～]：the～of an oar/a sword 桨面/剑背;the～of the hand 手掌;
 (2) 平地(area of level，low-lying ground) [C，通常pl]：wade into the mud/the salt～s 涉过泥滩/盐地;〖同〗shallow;
 (3) 降半音音符(sign (b) which makes a note a semitone lower) [C]：many～s in the tune 这首曲调中有许多降半音音符;
 (4) 漏气轮胎(tyre with little or no air in it) [C]：get a～on the way home 在回家的路上，车胎漏气了;〖同〗puncture