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adj (1)(中)空的(having an empty space inside;not solid)：a～ball/tube/tin/container 中空的球/空心管子/空罐頭/空容器;an old～tree trunk 空的老樹干;The pillars/chocolate eggs are all～. 柱子/巧克力球都是空心的?！纪絜mpty; 〖反〗solid，filled;

(2)凹的，凹陷的(sunken;deeply set)：a～face/basin/dish 消瘦的臉/很深的水盆/深的盤子;～eyes/cheeks 凹陷的雙眼/頰;be～eyed from lack of sleep 由于睡眠不足而兩眼凹陷;a～cheeked man一個雙頰凹陷的人;His cheeks are～.他的雙頰深陷。

(3)(聲音)空洞，(重濁)的(sounding as if made by，or in sth hollow)[通常作attrib]：～footsteps 沉悶的腳步聲;give a～groan/echo/sound 發(fā)出低沉的呻吟/空洞的回音/嗡嗡的聲響;have a～voice 發(fā)出空洞的聲音;His voice was～.他的聲音空空的。

(4) 1)虛假(的)(unreal;insincere;false)(fig)：make a～promise/truce/laugh 作出虛假的許諾/假意停戰(zhàn)/發(fā)出虛偽的笑聲;～laughter/sympathy/words虛偽的笑聲/同情/話;His words/The accusations rang～. 他的話/那些指責(zé)聽起來是虛假的。2)無真正價值的，無用的(worthless;not proving to have any value)：～arguments/joys/pleasures 毫無價值的爭辯/空喜歡/白高興;leave sb with a～feeling inside 給某人內(nèi)心留下空落落的感覺;win a～victory 獲得無真正價值的勝利;His independence/outward optimism/victory was(proved)～. 他的獨立/表面的樂觀/勝利是(證明是)毫無意義的。

→′hollowly adv 空洞地;虛偽地;′hollowness n 凹陷;空洞;

n (1)凹陷地，(尤指)小山谷(area，esp in the ground，that is lower than the rest，esp a small valley)[C]：hide in a～藏在小山谷里;have a picnic down in the～在這塊洼地里野餐;The cottage was in a～. 那房子在一個小山谷里。a wooded～樹木叢生的山谷;The ground was covered in little～s. 地面上布滿了小坑。

(2)洞，坑，凹陷處(empty space within anything;a hole，depression)[C]：～s in sb's cheeks 臉頰上的小坑;hold a small bird in the～of one's hand 手掌心里托著一只小鳥;〖同〗depression，hole;

vt 挖空(take out the contents of sth in order to make it hollow)[T+n，T+n+adv(out)]：～out a log/pumpkin 把一根原木/一個南瓜挖空;dams～ed out by rushing water 被流水沖擊而凹陷的大壩;

hollow out (v adv)挖洞做成(vt)：～out a canoe out of a log 把木頭挖空做獨木舟;～out a nest in a tree trunk 在樹干上營巢